# D calculate df 1 df 2 and df total 1 point total

• 4
• 100% (5) 5 out of 5 people found this document helpful

This preview shows page 3 - 4 out of 4 pages.

d. Calculate df1 , df2, and dftotal (1 point total: deduct .5 for each error)
e. Calculateestimated variance for population 1 (s12) and estimated variance for population 2 (s2) (2 points total: 1 point for each variance, .5 if the process is correct but the answer is wrong)2
PSY230SummerA2019f. Calculate the pooled variance (Spooled2)from the two population variances (from question e above) (1 point total: .5 if the process is correct but the answer is wrong)
h. Calculate standard deviation (Sdiffmean)of the comparison distribution (1 point total: .5 if the process is correct but the answer is wrong)Hint: This comparison distribution consists of differences between all possible sample means drawn from the two sampling distributions. Its standard deviation is the denominator of the t statistic formula. The standard deviation is .976i. Calculate the tstatistic (1 point total: .5 if the process is correct but the answer is wrong)
j. For the two-tailed test, find the critical t values for this hypothesis test based on the total degree of freedom (from question d above), and the preset alpha level. (1 point total)
k. Compare the calculated t statistic with the critical t value by stating which is more “extreme”, and thendraw a conclusion about the hypothesis test by stating clearly “reject” or “fail to reject” the null hypothesis. (2 points total: 1 for comparison, 1 for decision)
l. Calculate the pooled standard deviation for the populations (use the pooled variance calculated in question f); and then calculate the standardized effect size of this test. (2 points total: 1 for pooled standard deviation, 1 for effect size. Deduct .5 if a result is wrong but the process is correct.)
m. Based on the hypothesis test, is there a significant difference in education level between the males and the females in the sample? If so, in what direction is the gender difference? (1 point total: .5 for eachanswer)
• • • 