# PSY/315 Week 3

## PSY/315 Week 3

﻿University of Phoenix Material

Week 3 Practice Worksheet

Prepare a written response to the following questions.

Chapter 7

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

Step 1: State the hypothesis.
This is where a researcher states the null hypothesis about a value in a population and an alternative hypothesis. An alternative hypothesis contradicts the null hypothesis. The reason for testing the null hypothesis is because the researcher thinks it is wrong, which is stated in the alternative hypothesis.
Step 2: Set the criteria for the decision.
This criterion is set for the researcher to decide whether to retain or reject the null hypothesis. For the criteria to be set, researchers must state the level of significance for a hypothesis test and also collect data to show that the null hypothesis is not true.
Step 3: Compute the test statistic.
Researchers will evaluate how likely the sample outcome is, if the population mean stated in the null hypothesis is true. This is determined with a test statistic. A value will be produced that can be compared to the criterion that was set before the sample was selected.
Step 4: Make a decision.
If the probability of obtaining a sample mean is less than or equal to 5% when the null hypothesis is true, then the null hypothesis is rejected. If the probability is greater than 5% when the null hypothesis is true, then the null hypothesis is retained.

2. 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.

Study
µ
σ
Sample
Score
p
Tails of Tests
A
5
1
7
0.05
1 (high predicted)
B
5
1
7
0.05
2
C
5
1
7
0.01...