**10_Stat 315-Week 4 Chapter 4 Problems - Solved**

**#11.**** List the five steps of hypothesis testing, and explain the procedure and logic of each.**

**#14.**** Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or**

**cutoffs) on the comparison distribution at which the null hypothesis should be**

**rejected, (b) the Z score on the comparison distribution for the sample score, and**

**#18.**** A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the**

**brain area of interest has a percentage signal change of 58. From many previous**

**studies with this same math problems procedure (but not listening to music), it is**

**known that the signal change in this brain area is normally distributed with a**

**mean of 35 and a standard deviation of 10. (a) Using the .01 level, what should**

**the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution, the cutoff (or cutoffs), and the score of the sample on this distribution. (b) Then explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).**

**(c) your conclusion. Assume that all populations are normally distributed**

**Category:**Business, General Business

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