Suppose you conducted a study to test the hypothesis that social pressure affects memory accuracy. You set up a study where participants view a video of a person robbing a convenience store. Then, half of the participants watch a video of other “participants” discussing the crime. In reality, the “participants” in the video are part of the experiment, and some of the details of the crime that are discussed are inaccurate. The actual participants are told that they should consider other people’s perspectives on the crime because it is difficult for any one person to accurately remember all the details. The other half of the participants do not view the video discussion of the crime but are also told that it is difficult for any one person to accurately remember all the details of the crime. Thirty minutes after viewing the original crime video, all participants are given a recognition memory test about details of the crime. For this study, answer the following questions:
1. Using the chart in Figure 15.2 and what you know about the design of this study, what is the correct statistical test that should be used to analyze the data?
2. What is the null hypothesis that will be tested in the statistical test you described in (a)?
3. Suppose that 10 participants participated in each group in the study. For the recognition accuracy data provided below, use SPSS to conduct the correct statistical test to analyze these data.
· Video Discussion Group: 67, 80, 69, 72, 75, 79, 66, 71, 69, 79
· No Video Discussion Group: 78, 65, 79, 84, 88, 79, 89, 90, 85, 87
4. From the SPSS output you obtained, what can be concluded about the null hypothesis you stated in (b) above?