Statistics

1. In the Excel data file, the tab labeled Question 1 contains data on the number of times boys and girls raise their hands in class. Conduct the t-test: Two-Sample Assuming Equal Variances. a. What is the null hypothesis? b. What is the research hypothesis? c. Why run a Two-Sample Assuming Equal Variances t-test? d. Interpret the findings. What are the results of the hypothesis test? Can you reject the null hypothesis? 2. A corrections researcher is interested in gender differences in the amount of bail that arrestees have to pay. The data for this study is in the Excel data file, under the tab labeled Question 2. Conduct a t-test: Two-Sample Assuming Equal Variances. a. What is the null hypothesis? b. What is the research hypothesis? c. Why run a Two-Sample Assuming Equal Variances t-test? d. Interpret the findings. What are the results of the hypothesis test? Can you reject the null hypothesis? 3. Researchers would like to see if there is a difference in satisfaction levels in a group of families’ use of service centers following a social service intervention. The data for this study is in the Excel data file, under the tab labeled Question 3. Conduct the t-test: Paired with Two-Sample for Means. a. What is the null hypothesis? b. What is the research hypothesis? c. Why run a Two-Sample for Means t-test? d. Interpret the findings. What are the results of the hypothesis test? Can you reject the null hypothesis? 4. A researcher believes that alcohol intoxication might severely impair driving ability. To test this, she subjects 10 volunteers to a driving simulation test, first when sober, and then, after drinking amounts sufficient to raise their blood alcohol to .04. The researcher measures performance as the number of simulated obstacles with which the driver collides. Thus, the higher the number, the poorer the driving. The data is in the Excel file in the tab labeled Question 4. Test whether there are differences before and after drinking. Conduct a t-test: Two-Sample for Means. a. What is the null hypothesis? b. What is the research hypothesis? c. Why run a Two-Sample for Means t-test? d. Interpret the findings. What are the results of the hypothesis test? Can you reject the null hypothesis?

 

 

 

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