PSY 315 Week 3 Practice Problems Worksheet Recent

Note. Methods of computation may include the usage of Microsoft® Excel®, SPSS™, Lotus®, SAS®, Minitab®, or by-hand computation.

Chapter 4

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

Based on the information given for the following studies, decide whether to reject the null hypothesis. Assume that all populations are normally distributed. For each, give:

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 problem’s procedure (but not listening to music), it is known that the signal change in this brain 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 explicity 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.