2. The researcher would like to know if memory function changes significantly from the first testing session (Mem1) to the second testing session (Mem2). Perform a two-tailed ttest with = .05 to answer the following question:

Does memory performance change significantly from the first session to the second session? Null hypothesis is: a. .In memory performance, the first session and the second session are not significantly different. b. In memory performance, the second session significantly lower than the first session. c. In memory performance, the first session and the second session are significantly different.