University of Phoenix Material

Week Three Practice Problems

Prepare a written response to the following questions.

Chapter 4

11. List the five steps of hypothesis testing, and explain the procedure and logic of each. 1. “Restate the question as a research hypothesis and a null hypothesis about the populations”. One makes a research hypothesis about a predicted correspondence among populations. The research and the null hypothesis’ are opposites, meaning if one hypothesis is correct and true the other is not. 2. “Determine the characteristics of the comparison distribution”. This is important because the comparison distribution represents the population situation if the null hypothesis is factual. This is the main idea of hypothesis testing. 3. “Determine what the cutoff sample scores on the comparison distribution where the null hypothesis should be rejected”. This means determining a target against the results that will be compared or to what extreme the sample score would have to be for it to be too doubtful that they could get such an extreme score if the null hypothesis were true. Here the null hypothesis would be rejected if the point of the cutoff sample scores reaches or exceeds the sample score. If the null hypothesis is true the Z score is established at a score which would be improbable. 4. This step is to get the actual results for the sample. “Determine your sample’s score on the comparison distribution” . After one gets the test’s sample outcome, one moves on to step 5. 5. Here it is either declared the test is invalid or one rejects the null hypothesis by noting the similarity of the cutoff Z score to the samples

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) (a) 1.645