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##### Statistics and Probability

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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.

Paper#61126 | Written in 18-Jul-2015

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