## Using the results you got from Question 2 and a level of significance at .05 what are the two-tailed critical values associated with each? Would the null hypothesis be rejected?

Time to Practice: Week 4

Complete Parts A B and C below.

Part A

Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Textbook Resourceslink.

1. Using the data in the file named Ch. 11 Data Set 2 test the research hypothesis at the .05 level of significance that boys raise their hands in class more often than girls. Do this practice problem by hand using a calculator. What is your conclusion regarding the research hypothesis? Remember to first decide whether this is a one- or two-tailed test.

2. Practice the following problems by hand just to see if you can get the numbers right. Using the following information calculate the t-test statistic.

a.

b.

c.

3. Using the results you got from Question 2 and a level of significance at .05 what are the two-tailed critical values associated with each? Would the null hypothesis be rejected?

4. Using the data in the file named Ch. 11 Data Set 3 test the null hypothesis that urban and rural residents both have the same attitude toward gun control. Use IBM SPSS software to complete the analysis for this problem.

5. In the following examples indicate whether you would perform a t-test of independent means or dependent means.

a. Two groups were exposed to different treatment levels for ankle sprains. Which treatment was most effective?

b. A researcher in nursing wanted to know if the recovery of patients was quicker when some received additional in-home care whereas when others received the standard amount.

c. A group of adolescent boys was offered interpersonal skills counseling and then tested in September and May to see if there was any impact on family harmony.

d. One group of adult men was given instructions in reducing their high blood pressure whereas another was not given any instructions.

e. One group of men was provided access to an exercise program and tested two times over a 6-month period for heart health.

6. The data set for this problem can be found through the Sage Materials in the Student Textbook Resource Access link listed under Academic Resources. For Ch. 12 Data Set 3 compute the t value and write a conclusion on whether there is a difference in satisfaction level in a group of families use of service centers following a social service intervention on a scale from 1 to 15. Do this exercise using IBM SPSS software and report the exact probability of the outcome. Copy and paste the output from IBMSPSS into this worksheet.

You may use SPSS for this problemYou may use SPSS for this problem or do it by hand. A1. famous brand-name manufacturer wants to know whether people prefer Nibbles or Wribbles. They sample each type of cracker and indicate their like or dislike on a scale from 1 to 10. Which do they like the most? Paste your t-test output into your answer and write a very brief analysis.