Psychology researchers have demonstrated that memory is usually improved by studying material on multiple occasions rather than one time only (distributed practice effects). A recent study examining this effect studied two different delay intervals. Group 1 had a one-day interval between study sessions and group two had a one-week gap between study sessions. Results for each study condition are presented below: One-Day Gap n = 20 M = 26.4 SS = 395 One-Week Gap n = 20 M = 29.6 SS = 460. Do the data indicate a significant difference between the two study conditions? Evaluate this hypothesis at the .05 significance level? · State your hypotheses · State the critical t-value · Calculate the t-value for the sample mean difference · State your conclusion about the null hypothesis
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Psychology researchers have demonstrated that memory is usually improved by studying material on multiple occasions rather than one time only (distributed practice effects). A recent study examining this effect studied two different delay intervals. Group 1 had a one-day interval between study sessions and group two had a one-week gap between study sessions. Results for each study condition are presented below:
One-Day Gap
n = 20
M = 26.4
SS = 395
One-Week Gap
n = 20
M = 29.6
SS = 460.
Do the data indicate a significant difference between the two study conditions? Evaluate this hypothesis at the .05 significance level?
· State your hypotheses
· State the critical t-value
· Calculate the t-value for the sample mean difference
· State your conclusion about the null hypothesis
Show all calculations.
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