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Mathematics, 05.05.2020 03:43 kmc3490
A theater arts department enlisted the help of a social psychology professor to design a study to see if being surrounded by highly attractive people affected the performance of young actors. Thirty student actors were randomly assigned to act a particular scene under one of two conditions: For 13 of the actors, the other performers were dressed and made up to look very attractive; for the other 17 actors, the other performers were dressed and made up to look very unattractive. A panel of judges rated the performance of the two groups, with higher scores indicating a better performance, and the mean performance ratings for the actors with attractive co-performers was 4.3 (SD = .86) and with unattractive co-performers, the mean was 5.4 (SD = 1.30). Using the .05 significance level, did acting with attractive co-performers affect performance?Step 1: State Hypotheses (2 points)Null:Research:Step 2: Determine Comparison Distribution (1 point)What is the mean and standard deviation of the comparison distribution?Step 3: Set the Criteria for a Decision (3 points)One-tailed or two-tailed?df =Critical value(s):Step 4: Compute the Test Statistic (6 points)Compute the pooled estimate of the population variance (round to 2 decimal places)Compute the estimated standard error (also called the standard deviation of the distribution of differences between means). (round to 2 decimal places)Compute the t-statistic (round to 2 decimal places)Step 5: Make a Decision (3 points)Reject/Fail to Reject the null?Write your results as they would appear in a research journal (one sentence).
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