10:51 Stat95Su14tTests-1.pdf Q Extra Credit Assignment A researcher examined the effectiveness of a new sleep medication compared with placebo. People were randomly assigned to receive the medication or placebo. Sleep times were measured (in hours). Here are the data: Medication group: M = 6 hrs, SD = 2 hrs, n = 20 . Placebo group: M = 5.0 hrs, SD = 3 hrs, n = 20 1. Name the independent and dependent variables 2. Compute an independent-samples t test (a = .05, two-tailed) using GraphPad.com QuickCalcs and write down the following: Null and alternative hypotheses being tested Value of t, df, Std. Error of the Difference, p-value, critical value of t, 95% confidence interval for the mean difference. Your decision about the null based on the critical value and the p-value 35 Extra Credit Assignment Now imagine the same scenario, but with larger sample sizes . Here are the data: Medication group: M = 6 hrs, SD = 2 hrs, n = 60 . Placebo group: M = 5.0 hrs, SD = 3 hrs, n = 60 Compute an independent-samples t test (a = .05, two-tailed) using GraphPad.com QuickCalcs and write down the following: Null and alternative hypotheses being tested Value of t, df, Std. Error of the Difference, p-value, critical value of t, 95% confidence interval for the mean difference. Your decision about the null based on the critical value and the p-value What happened in the t test and the confidence interval when we increased the sample size from 20 to 60 participants per group? Submit a screen shots of the results along with all requested information for both scenarios. You may work in teams of up to 2 people. 36 Previous Next O= 8 0= Dashboard Calendar To Do Notifications Inbox