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#### All Subjects Statistics General Statistics

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# stats data bank-Which of the following is most likely a population as opposed to a sample?

Question # 00007957
Subject: Statistics
Due on: 02/28/2014
Posted On: 02/06/2014 12:35 AM

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Question

1.

Which of the following is most likely a population as opposed to a sample?

 respondents to a newspaper survey the first 5 students completing an assignment every third person to arrive at the bank registered voters in a county

4 points

Question 2

1.

Which of the following can be reduced by proper interviewer training

 sampling error measurement error both of the above none of the above

4 points

Question 3

1.

According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observation will be contained within 1 (one) standard deviation around the arithmetic mean.

 68.26 75 88.89 93.75

4 points

Question 4

1.

The probability that a new advertising campaign will increase sales is asssessed as being 0.80. The probabliity that the cost of devolping the new add campaign can be kept within the original budget allocation is 0.40. Assuming that the two events are independent, the probability that the cost is kept withing budget and the campain will increase sales is:

 0.2 0.32 0.4 0.88

4 points

Question 5

1.

In a non symmmetrical distribution:

 the range equals the interquartile range the interquartile range equals the mean the median does not equal the mean the variance equals the standard deviation

4 points

Question 6

1.

Which statement about the standard normal distribution is NOT true

 It has a mean of 0 It has a variance of 0 has an area under the probability distribution curve equal to 1. has a standard deviation of 1.

4 points

Question 7

1.

If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 4.5 minutes and a standard deviation of 3.2 minute, find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than 4 minutes.

 0.4379 0.5 0.562 0.9999

4 points

Question 8

1.

The following data represent the response (Y for yes and N for no) from a sample of 40 college students to the question SDo you currently own shares in any stocks? (8 points)N N Y N N N N Y N Y N N Y N Y Y N N N YN Y N N N N Y N N N Y N N N Y N N Y N NWhat is the standard error of the sample proportion of college students who own stocks?

 0.0114 0.0724 0.4582 2.8982

4 points

Question 9

1.

If an economist wishes to determine whether there is evidence that average family income in a community exceeds \$25,000

 either a one-tailed or two-tailed test could be used with equivalint results. a one tailed test should be utilized. a two-tailed test shoud be utilized. none of the above.

4 points

Question 10

1.

The power of a statistical test is

 the probability of not rejecting Ho when it is false. the probability of rejecting Ho when it is true. the probablility of not rejecting Ho when it is true. the proability of rejecting Ho when it is false.

4 points

Question 11

1.

If we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to

 39 38 19 18

4 points

Question 12

1.

The statictical distribution used for testing the difference between two population variances is the ___ distribution.

 t standardized normal binomial F

4 points

Question 13

1.

a "robust" test procedure is one which

 requires a sofphisticaed level of measurement. requires a semi-circular shaped population. is sensetive to slight violations in its assumptions. is insensetive to slight violations in its assumptions.

4 points

Question 14

1.

Why would you use the Tukey-Kramer procedure?

 to test for normality to test for homogeneity of variance to test for independence of errors to test for the differences in pairwise means

4 points

Question 15

1.

For a given level of significance, if the sample size is increased, the power of the test will

 increase stay the same decrease

4 points

Question 16

1.

The standard error of the sample proportion is the largest when the sample proportion reaches

 0.9 0.8 1 0.5

4 points

Question 17

1.

An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be \$1,000. A random sample of 50 individuals resulted in an average income of \$15,000. What sample size would the economist need to use if he wants a 95% confidence interval no wider than plus or minus \$100?

 1486 individuals 385 individuals 126 individuals 85 individuals

4 points

Question 18

1.

A 99% confidence intereval estimate can be interpreted to mean that

 if all possible samples are taken and confidence interval estimates are developed, 99% of them would include the true population mean somewhere within their interval. we have 99% confidence that we have selected a sample whose interval does include the population mean. both of the above none of the above

4 points

Question 19

1.

The Y intercept (bo) represnts the

 the predicted value of Y when X = 0. the change in estimated average y per unit change in X. predicted value of Y. variation around the sample regression line.

4 points

Question 20

1.

The slope (b1) represents

 the predictied value of Y when X = 0 the estimated average change in Y per unit change in X. the predicted value of Y. variation around the line of regression.

4 points

Question 21

1.

The least squares method minimizes which of the following?

 SSR SSE SST all the above

4 points

Question 22

1.

In performing a regression analysis involving two numerical variables, we are ssuming:

 the variances of X and Y are equal. the variation around the line of regression is the same for each X value. that X and Y are independent. all of the above.

4 points

Question 23

1.

The strength of the linear relationship between to numerical variables may be measured by the

 scatter diagram coefficient of correlation slope Y intercept

4 points

Question 24

1.

In a multiple regression mode, the value of the coefficient of multiple determination

 has to fall between -1 and +1. has to fall between 0 and +1. has to fall between -1 and 0. can falll between any pair of real numbers.

4 points

Question 25

1.

When testing for independence in a contingency table with 3 rows and 4 columns, there are ______ degrees of freedom.

 5 6 7 12

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#### Which of the following is most likely a population as opposed to a sample?

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Preview: toAnswer393819184 xxxxxx   Question xxxxxxx statictical distribution xxxx for testing xxx difference xxxxxxx xxx population xxxxxxxxx is the  xxx distribution  Answertstandardized xxxxxxxxxxxxxxxx points xxxxxxxxxxxx xxxxx "robust" xxxx procedure is xxx which Answerrequires a xxxxxxxxxxxxx level xx xxxxxxxxxxx requires x semi-circular shaped xxxxxxxxxx is sensetive xx slight xxxxxxxxxx xx its xxxxxxxxxxx is insensetive xx slight violations xx its xxxxxxxxxxx x points xxxxxxxxxxxx 14 Why would xxx use the xxxxxxxxxxxx procedure?Answerto xxxx xxx normalityto xxxx for homogeneity xx varianceto test xxx independence xx xxxxxxxx test xxx the differences xx pairwise means4 xxxxxx   Question xxxxxxx x given xxxxx of significance, xx the sample xxxx is xxxxxxxxxx xxx power xx the test xxxxxxxxxxxxxxxxxxxxxx the samedecrease4 xxxxxx   Question xxxxxxx xxxxxxxx error xx the sample xxxxxxxxxx is the xxxxxxx when xxx xxxxxx proportion xxxxxxxxxxxxxx 90 810 xx points   Question xxxxxx economist xx xxxxxxxxxx in xxxxxxxx the incomes xx consumers in x particular xxxxxx xx The xxxxxxxxxx standard deviation xx know to xx \$1,000 xx x random xxxxxx of 50 xxxxxxxxxxx resulted in xx average xxxxxx xx \$15,000 xx What sample xxxx would the xxxxxxxxx need xx xxx if xx wants a 95% xxxxxxxxxx interval no xxxxx than xxxx xx minus xxxxxxxxxxxxxxx individuals385 individuals126 xxxxxxxxxxxxx individuals4 points xxxxxxxxxxxx 18 A.....
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