## PSY 315 Inferential Research and Statistics Project Part 2

PSY 315 Inferential Research and Statistics Project Part 2

**Analyze the data from Part 1 using Microsoft® Excel® software.
Write a 700- to 875-word paper that includes the following information:**

Describe what method you are using to compare groups.

Copy and paste the output into a Microsoft® Word document, and also answer the following questions:

What is the significance level of the comparison?

What was the alpha level you identified in Week 3?

What was the means and variance for each variable?

What was the test statistic?

What was the critical value for both the one- and two-tailed test?

Was your test one-tailed or two-tailed?

Were you able to reject the null hypothesis? In other words, did you prove there was a difference?

Talk about what these results mean in everyday language and in context to your chosen scenario.

Make a recommendation based on the findings.

Format your paper according to APA guidelines.

**Example of Output You Would Use to Answer These Questions**

**Resource:Statistics for Psychology**

**Complete the Week Three Practice Problems Worksheet.**

**Click the assignment files tab to submit your assignment.**

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. 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.**

**c. Your conclusion.
**

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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.

**b. Explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).**