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Question 1 of 402.5 PointsIn the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The hypotheses are:H0 : µ  = 8.0 hoursHa : µ  > 8.0 hoursExplain the meaning of a Type II error.A. Concluding that µ > 8.0 hours when in fact µ > 8.0 hoursB. Failing to reject the hypothesis that µ = 8.0 hours when in fact µ > 8.0 hoursC. Concluding that µ > 8.0 hoursD. Failing to reject the hypothesis that µ = 8.0 hours when in fact µ = 8.0 hoursQuestion 2 of 402.5 Pointswithout computing a P-value, determine whether the alternate hypothesis is supported and give a reason for your conclusion.A. is less than 1 standard deviation above the claimed mean.B. is more than 4 standard deviations above the claimed mean.C. is less than 1 standard deviation above the claimed mean.D. is more than 4 standard deviations above the claimed mean.Question 3 of 402.5 PointsA poll of 1,068 adult Americans reveals that 52% of the voters surveyed prefer the Democratic candidate for the presidency. At the 0.05 significance level, test the claim that more than half of all voters prefer the Democrat.A. Reject the null hypothesis. Conclude that there is insufficient evidence that more than half of all voters prefer Democrats.B. Do not reject the null hypothesis. Conclude that there is sufficient evidence that more than half of all voters prefer Democrats.C. Reject the null hypothesis. Conclude that there is sufficient evidence that more than half of all voters prefer Democrats.D. Do not reject the null hypothesis. Conclude that there is insufficient evidence that more than half of all voters prefer Democrats.Question 4 of 402.5 PointsA manufacturer claims that the mean amount of juice in its 16 ounce bottles is 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to determine whether the mean amount is actually less than this. The mean volume of juice for a random sample of 70 bottles was 15.94 ounces. Do the data provide sufficient evidence to conclude that the mean amount of juice for all 16-ounce bottles, µ, is less than 16.1 ounces? Perform the appropriate hypothesis test using a significance level of 0.10. Assume that  = 0.9 ounces.  A.    The z of  1.49    provides sufficient evidence to conclude that the mean amount of juice is less than 16.1 oz.B. The z of  1.49 does not provide sufficient evidence to conclude that the mean amount of juice is less than 16.1 oz.C. The z of  0.1778 does not provide sufficient evidence to conclude that the mean amount of juice is less than 16.1 oz.D. The z of  0.1778 provides sufficient evidence to conclude that the mean amount of juice is less than 16.1 oz.Question 5 of 402.5 Points A researcher wants to check the claim that convicted burglars spend an average of 18.7 months in jail. She takes a random sample of 35 such cases from court files and finds that  months. Assume that the population standard deviation is 7 months. Test the null hypothesis that µ = 18.7 at the 0.05 significance level.A. Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.B. Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.C. Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.D. Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.Question 6 of 402.5 PointsIn the past, the mean running time for a certain type of flashlight battery has been 9.8 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The hypotheses are:H0 : µ  = 9.8 hoursHa : µ  > 9.8 hoursSuppose that the results of the sampling lead to rejection of the null hypothesis. Classify that conclusion as a Type I error, a Type II error, or a correct decision, if in fact the mean running time has not increased.A. Type I errorB. Type II errorC. Correct decisionD. Can not be determined from this informationQuestion 7 of 402.5 PointsA two-tailed test is conducted at the 0.10 significance level. What is the P-value required to reject the null hypothesis?A. Greater than or equal to .010B. Greater than or equal to 0.05C. Less than or equal to 0.10D. Less than or equal to 0.05Question 8 of 402.5 PointsA study of a brand of “in the shell peanuts” gives the following results:A significant event at the 0.01 level is a fan getting a bag with how many peanuts?A. 30 peanutsB. 25 or 30 peanutsC. 25 or 55 peanutsD. 25 peanutsQuestion 9 of 402.5 PointsIf a fan purchased a bag with 30 peanuts, what is the lowest level at which this would be a significant event? A. 0.05B. 0.025C. 0.01D. It is not significant at any of the levels givenQuestion 10 of 402.5 PointsA researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a mean different from the 600 mg claimed by the manufacturer. Test this claim at the 0.02 level of significance. The mean acetaminophen content for a random sample of n = 41 tablets is 603.3 mg. Assume that the population standard deviation is 4.9 mg.A. Since the test statistic is greater than the critical z, there is sufficient evidence to accept the null hypothesis and to support the claim that the mean content of acetaminophen is 600 mg.B. Since the test statistic is greater than the critical z, there is sufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.C. Since the test statistic is less than the critical z, there is sufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.D. Since the test statistic is greater than the critical z, there is insufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.Question 11 of 402.5 PointsA right-tailed test is conducted at the 5% significance level. Which of the following z-scores is the smallest one in absolute value that leads to rejection of the null hypothesis?  A. 1.61B. 1.85C. -1.98D. -2.06Question 12 of 402.5 PointsA supplier of DVDs claims that no more than 1% of the DVDs are defective. In a random sample of 600 DVDs, it is found that 3% are defective, but the supplier claims that this is only a sample fluctuation. At the 0.01 level of significance, test the supplier’s claim that no more than 1% are defective.A. Do not reject the null hypothesis and conclude that there is evidence to support the claim that more than 1% of the DVDs are defective.B. Reject the null hypothesis and conclude that there is insufficient evidence to support the claim that more than 1% of the DVDs are defective.C. Do not reject the null hypothesis and conclude that there is insufficient evidence to support the claim that more than 1% of the DVDs are defective.D. Reject the null hypothesis and conclude that there is sufficient evidence to support the claim that more than 1% of the DVDs are defective.Question 13 of 402.5 PointsA consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described.A. H0: µ = 16 ounces     Ha: µ < 16 ouncesB. H0: µ  16 ounces     Ha: µ = 16 ouncesC. H0: µ = 16 ounces     Ha: µ > 16 ouncesD. H0: µ = 16 ounces      Ha: µ  16 ouncesQuestion 14 of 402.5 PointsA consumer group claims that the mean running time for a certain type of flashlight battery is not the same as the manufacturer’s claims. Determine the null and alternative hypotheses for the test described.A. H0: µ = Manufacturer’s claims     Ha: µ < Manufacturer’s claimsB.   H0: µ = Manufacturer’s claims    Ha: µ  Manufacturer’s claims  C. H0: µ = Manufacturer’s claims     Ha: µ > Manufacturer’s claimsD. H0: µ  Manufacturer’s claims     Ha: µ = Manufacturer’s claimsQuestion 15 of 402.5 PointsA two-tailed test is conducted at the 5% significance level. Which of the z-scores below is the smallest one that leads to rejection of the null hypothesis?A. 1.12B. 1.48C. 1.84D. 2.15Question 16 of 402.5 PointsA nationwide study of American homeowners revealed that 65% have one or more lawn mowers. A lawn equipment manufacturer, located in Omaha, feels the estimate is too low for households in Omaha. Find the P-value for a test of the claim that the proportion with lawn mowers in Omaha is higher than 65%. Among 497 randomly selected homes in Omaha, 340 had one or more lawn mowers. Use Table 5.1 to find the best answer.A. 0.0559B. 0.1118C. 0.0252D. 0.0505Question 17 of 402.5 PointsIn 1990, the average duration of long-distance telephone calls originating in one town was 9.3 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from the 1990 mean of 9.3 minutes. Formulate the null and alternative hypotheses for the study described.A. Ho: µ = 9.3 minutes     H  : µ < 9.3 minutesB. Ho: µ = 9.3 minutes     H  : µ > 9.3 minutesC. Ho: µ = 9.3 minutes      H  : µ  9.3 minutesD. Ho: µ  9.3 minutes     H  : µ = 9.3 minutesQuestion 18 of 402.5 PointsA long-distance telephone company claims that the mean duration of long-distance telephone calls originating in one town was greater than 9.4 minutes, which is the average for the state. Determine the conclusion of the hypothesis test assuming that the results of the sampling do not lead to rejection of the null hypothesis.A. Conclusion: Support the claim that the mean is less than 9.4 minutes.B. Conclusion: Support the claim that the mean is greater than 9.4 minutes.C. Conclusion: Support the claim that the mean is equal to 9.4 minutes.D. Conclusion: Do not support the claim that the mean is greater than 9.4 minutes.Question 19 of 402.5 PointsA consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the conclusion of the hypothesis test assuming that the results of the sampling lead to rejection of the null hypothesis.A. Conclusion: Support the claim that the mean is equal to 16 ounces.B. Conclusion: Support the claim that the mean is greater than 16 ounces.C. Conclusion: Support the claim that the mean is not equal to 16 ounces.D. Conclusion: Support the claim that the mean is less than 16 ounces.Question 20 of 402.5 PointsAt one school, the mean amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased.Formulate the null and alternative hypotheses for the study described.A. Ho: µ = 18.4 hours     H  : µ  18.4 hoursB. Ho: µ = 18.4 hours     H  : µ < 18.4 hoursC. Ho: µ  18.4 hours     H  : µ < 18.4 hoursD. Ho: µ = 18.4 hours     H  : µ > 18.4 hoursQuestion 21 of 402.5 PointsA large test statistic F tells us that the sample means __________ the data within the individual samples, which would be unlikely if the populations means really were equal (as the null hypothesis claims).A. differ more thanB. differ less thanC. are equal toD. do not vary withQuestion 22 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale85260Female23840Total1090100Find the value of the X2 statistic for the data above.A. 1.463B. 1.852C. 1.947D. 1.949Question 23 of 402.5 PointsA simple random sample from a normal distribution is taken in order to obtain a 95% confidence interval for the population mean. If the sample size is 8, the sample mean x̄ is 22, and the sample standard deviation s is 6.3, what is the margin of error? Show your answer to 2 decimal places.A. df = 7; E = 3.3445.38 = 5.6566B. df = 8; E = 3.3445.38 = 5.6566C. df = 6; E = 2.3656.38 = 5.769D. df = 7; E = 2.3656.38 = 5.869Question 24 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent.The critical value of X2 for a 2 x 2 table using a 0.05 significance level is 3.841. If the value of the X2  statistic is 3.179, state your conclusion about the relationship between gender and colorblindness.A. Do not reject H0.B. Reject H0.C. There is sufficient evidence to support the claim that gender and colorblindness are not related.D. There is not sufficient evidence to accept or reject H0.Question 25 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale85260Female23840Total1090100State the null and alternative hypothesis for the test associated with this data.A. H0: Colorblindness and gender are dependent characteristics.Ha: Colorblindness and gender are not related in any way.B. H0:  Colorblindness and gender are dependent characteristics.Ha:  Colorblindness and gender are related in some way.C. H0: Colorblindness and gender are independent characteristics.Ha: Colorblindness and gender are not related in any way.D. H0: Colorblindness and gender are independent characteristics.Ha: Colorblindness and gender are related in some way.Question 26 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale75360Female13940Total892100Find the value of the X2 statistic for the data above.A. 1.325B. 1.318C. 1.286D. 1.264Question 27 of 402.5 PointsA 95% confidence interval for the mean of a normal population is found to be 13.2 < µ < 22.4. What is the margin of error?A. 4.6B. 4.4C. 4.2D. 5.6Question 28 of 402.5 PointsThe following data were analyzed using one-way analysis of variance.ABC342719262321312922282112Which one of the following statements is correct?A. The purpose of the analysis is to determine whether the groups A, B, and C are independent.B. The purpose of the analysis is to test the hypothesis that the population means of the three groups are equal.C. The purpose of the analysis is to test the hypothesis that the population variances of the three groups are equal.D. The purpose of the analysis is to test the hypothesis that the sample means of the three groups are equal.Question 29 of 402.5 PointsA 95% confidence interval for the mean of a normal population is found to be 15.6 < µ < 25.2. What is the margin of error?A. 3.9B. 4.8C. 4.9D. 3.7Question 30 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The critical value of X2 for a 2 x 2 table using a 0.05 significance level is 3.841. If the value of the X2 statistic is 3.427, state your conclusion about the relationship between gender and colorblindness.A. Do not reject H0. There is not sufficient evidence to support the claim that gender and colorblindness are related.B. Do not reject H0. There is sufficient evidence to support the claim that gender and colorblindness are related.C. Reject H0. There is not sufficient evidence to support the claim that gender and colorblindness are related.D. Reject H0. There is sufficient evidence to support the claim that gender and colorblindness are related.Question 31 of 402.5 PointsThe following data were analyzed using one-way analysis of variance.ABC342719262331312922282122Which one of the following statements is correct?A. The purpose of the analysis is to determine whether the groups A, B, and C are independent.B. The purpose of the analysis is to test the hypothesis that the population means of the three groups are equal.C. The purpose of the analysis is to test the hypothesis that the population variances of the three groups are equal.D. The purpose of the analysis is to test the hypothesis that the sample means of the three groups are equal.Question 32 of 402.5 PointsWhich of the following statements is true?A. The p distribution cannot be used when finding a confidence interval for the population mean with a small sample anytime the population standard deviation is unknown.B. The t distribution can be used when finding a confidence interval for the population mean with a small sample anytime the population standard deviation is unknown.C. The t distribution cannot be used when finding a confidence interval for the population mean with a small sample anytime the population standard deviation is unknown.D. The p distribution can be used when finding a confidence interval for the population mean with a small sample anytime the population standard deviation is unknown.Question 33 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale85260Female23840Total1090100If gender and colorblindness are independent, find the expected values corresponding to the four combinations of gender and colorblindness, and enter them in the following table along with row and column totals. ColorblindNot ColorblindTotalMale   Female   Total    A. Male Colorblind 6.0; Male Not Colorblind 54.0B. Male Colorblind 7.0; Male Not Colorblind 53.0C. Male Colorblind 8.0; Male Not Colorblind 52.0D. Male Colorblind 6.0; Male Not Colorblind 53.0Question 34 of 402.5 PointsA golfer wished to find a ball that would travel more than 180 yards when hit with his 5-iron with a club speed of 90 miles per hour. He had a golf equipment lab test a low compression ball by having a robot swing his club 7 times at the required speed.Data from this test resulted in a sample mean of 184.2 yards and a sample standard deviation of 5.8 yards. Assuming normality, carry out a hypothesis test at the 0.05 significance level to determine whether the ball meets the golfer’s requirements. Use the partial t-table below. Area in one tail 0.0250.05 Area in two tailsDegrees ofFreedomn - 10.050.1062.4471.94372.3651.89582.3061.86092.2621.833A. Reject the null hypothesis. The data do not provide sufficient evidence that the average distance is greater than 180 yards.B. Reject the null hypothesis. The data do provide sufficient evidence that the average distance is greater than 180 yards.C. Do not reject the null hypothesis. The data do provide sufficient evidence that the average distance is greater than 180 yards.D. Do not reject the null hypothesis. The data do not provide sufficient evidence that the average distance is greater than 180 yards.Question 35 of 402.5 PointsA golfer wished to find a ball that would travel more than 170 yards when hit with his 6-iron with a club head speed of 90 miles per hour. He had a golf equipment lab test a low compression ball by having a robot swing his club 12 times at the required speed. State the null and alternative hypotheses for this test.A. H0: µ > 170; Ha: µ = 170B. H0: µ < 170; Ha: µ = 170C. H0: µ = 170; Ha: µ > 170D. H0: µ = 160; Ha: µ > 160Question 36 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale75360Female13940Total892100If gender and colorblindness are independent, find the expected values corresponding to the male combinations of gender and colorblindness.A. Colorblind Male 4.8; Not Colorblind Male 55.2B. Colorblind Male 6.8; Not Colorblind Male 53.2C. Colorblind Male 4.8; Not Colorblind Male 55.4D. Colorblind Male 4.8; Not Colorblind Male 56.2Question 37 of 402.5 PointsThe margin of error in estimating the population mean of a normal population is E = 9.3 when the sample size is 15. If the sample size had been 25 and the sample standard deviation did not change, would the margin of error be larger or smaller than 9.3?A. Smaller. E increases as the square root of the sample size gets larger.B. Smaller. E decreases as the square root of the sample size gets larger.C. Larger. E decreases as the square root of the sample size gets larger.D. Larger. E increases as the square root of the sample size gets larger.Question 38 of 402.5 PointsWhich of the following statements is true?A. The t distribution can be used when finding a confidence interval for the population mean whenever the sample size is small.B. The p distribution can be used when finding a confidence interval for the population mean whenever the sample size is small.C. The t distribution cannot be used when finding a confidence interval for the population mean whenever the sample size is small.D. The p distribution cannot be used when finding a confidence interval for the sample mean whenever the sample size is small.Question 39 of 402.5 PointsOne hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. ColorblindNot ColorblindTotalMale75360Female13940Total892100If gender and colorblindness are independent, find the expected values corresponding to the female combinations of gender and colorblindness.A. Colorblind Female 4.8; Not Colorblind Female 55.2B. Colorblind Female 3.2; Not Colorblind Female 36.8C. Colorblind Female 4.8; Not Colorblind Female 35.2D. Colorblind Female 3.8; Not Colorblind Female 36.2Question 40 of 402.5 PointsA 95% confidence interval for the mean of a normal population is found to be 15.6 < µ < 24.8. What is the margin of error?A. 4.4B. 4.6C. 4.8D. 5.0
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