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Statistics and Probability

Question # 00009147
Subject: Mathematics / General Mathematics
Due on: 02/26/2014
Posted On: 02/26/2014 01:57 AM
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Prof-Hayat
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Question 6. Given the following information, would your decision be to reject or fail to reject the null hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for your conclusion.

a. The null hypothesis that there is no relationship between the type of music a person listens to and his crime rate (p < .05).
b. The null hypothesis that there is no relationship between the amount of coffee consumption and GPA (p = .62).
c. The null hypothesis that there is a negative relationship between the number of hours worked and level of job satisfaction (p = .51).
7. Why is it harder to find a significant outcome (all other things being equal) when the research hypothesis is being tested at the .01 rather than the .05 level of significance?

8. Why should we think in terms of “failing to reject” the null rather than just accepting it?

9. When is it appropriate to use the one-sample z test?

10. What similarity does a z test have to a simple z or standard score?

11. For the following situations, write out a research hypothesis:

a. Bob wants to know if the weight loss for his group on the chocolate-only diet is representative of weight loss in a large population of middle-aged men.
b. The health department is charged with finding out if the rate of flu per thousand citizens for this past flu season is comparable to the average rate of the past 50 seasons.
c. Blair is almost sure that his monthly costs for the past year are not representative of his average monthly costs over the past 20 years.

12. There were about 15 flu cases per week, this flu season, in the Oshkosh school system. The weekly average for the entire state is 16 and the standard deviation, is 2.35. Are the kids in Oshkosh as sick as the kids throughout the state?

From Salkind (2011). Copyright © 2012 SAGE. All Rights Reserved. Adapted with permission.

Part B

Complete the following questions. Be specific and provide examples when relevant.

Cite any sources consistent with APA guidelines.

Question Answer
The average raw math achievement score for third graders at a Smith elementary school is 137; third graders statewide score an average of 124 with a standard deviation of 7. Are the Smith third graders better at math than third graders throughout the state? Perform the correct statistical test, applying the eight steps of the hypothesis testing process as demonstrated on pp. 185–187 of Statistics for People Who (Think they) Hate Statistics.
What is a research question that you would like to answer? Write the null and research hypotheses. Would you use a one- or two-tailed test? Why?
What do we mean when we say that a statistical result is significant? What is the difference between a statistically significant and a meaningful result? Why is statistical significance important?
Describe a Type I error for the previous study that compares third graders’ math achievement. Describe a Type II error for that study.
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Statistics and Probability

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Posted On: 02/26/2014 02:13 AM
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Preview: hypothesis xxxxxxx no xxxxxxxxxxxx between variables? xxx null hypothesis xxxxxxxx no xxxxxxxxxxxx xxxxxxx it xx the starting xxxxx and in xxx absence xx xxxxx data xx presumed to xx true Create x research xxxxxxxxxx xxxxxx using x one-tailed test xxx a research xxxxxxxxxx tested xxxxx x two-tailed xxxx One tailed: xxxx 25 seocondssH0:Drug xxx no xxxxxx xx response xxxx , H1:Drug xxxxxx response mdrug=<1 xx secondsTwo xxxxxxx xxxxxx drug xxx no effect=?m=even x 25 even xxxx drug, xx xxxxx has xx effect=?1 25 xxxx the drug xx givenWhat xxxx xxx critical xxxxx represent? A xxxxxxxx value represents xxx value xxx xxxxx assume xxx test statistic xx produce if xxx null xxxxxxxxxx xxx true xxxxx the following xxxxxxxxxxxx would your xxxxxxxx be xx xxxxxx or xxxx to reject xxx null hypothesis? xxxxxxx the xxxxx xx significance xx 05 for xxxxxxxx making, provide xx explanation xxx xxxx conclusion xxx null hypothesis xxxx there is xx relationship xxxxxxx xxx type xx music a xxxxxx listens to xxx his xxxxx xxxx (p xxxx 05) Answer: xx reject the xxxx hypothesis xxxxxxx xxx p xxxxx is less xxxx 0 05The xxxx hypothesis xxxx xxxxx is xx relationship between xxx amount of xxxxxx consumption xxx xxx (p x 62) Answer: xxxxx p=0 62 xxxxx is xxxxxxx xxxx the x 05 therefore xx accept the xxxx ghypthesis xxx xxxx hypothesis xxxx there is x negative relationship xxxxxxx the xxxxxx xx hours xxxxxx and level xx job satisfaction xx = xxx xxxx since xxx 51 which xx greater than xxx 0 xx xxxxxxxxx we xxxxxx the null xxxxxxxxxx Why is xx harder xx xxxx a xxxxxxxxxxx outcome (all xxxxx things being xxxxxx when xxx xxxxxxxx hypothesis xx being tested xx the 01 xxxxxx than xxx xx level xx significance?Answer: When xx test conducted xx 0 xxxxxx xxx research xxxxxxxxxx is a xxxx smaller set xx values xxx xxxx test xxxxxxxxx at 0 xx then the xxxxxxxx hypothesis xx xxxxx large xxxxx the 'contradictory' xxxx in the xxxxxxxx hypothesis xxxxx xx quite xxxxx is far xxxx likely Why xxxxxx we xxxxx xx terms xx “failing to
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