Which of the following sets of data would produce the largest value for Cohen’s d if the difference between the samples is 5 points? ​ Select one: a. ​ n = 15 for both samples and a pooled variance of 15 b. ​ n = 90 for both samples and a pooled variance of 15 c. ​ Cohen’s d is the same for all three of the samples. d. ​ n = 5 for both samples and a pooled variance of 15

Please complete the following:   Explain in a sentence what a certain Cohen’s d means.   Explain in a sentence what a certain variance (r2) means.   What are the magnitudes of effect sizes for Cohen’s d?   What are the magnitudes of effect sizes for variance (r2)?

One sample has SS = 60 and a second sample has %3D SS = 48. a. If n = 7 for both samples, find each of the sample %3D variances, and calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.

Suppose that 67% of college students in Australia use more than 1.65 gigabytes of data ontheir mobile phone per month.  If the monthly mobile data usage by college students isnormally distributed with variance of 2.25, what will be the average mobile data usage?a. 0.66 b. 0.99 c. 2.31 d. 2.64

A teacher is interested in assessing whether or not there is the same amount of variance in the scores of a particular type of test between male and female students. She believes that the variance for girls is higher than it is for boys. After grading the test she measures the following:  In her class, 15 boys had a variance of 460 and 13 girls had a variance of 1,400. Set up hypotheses to test if the teacher’s assumption that the girls’ variance of scores on the test is higher than the boys’ variance. Perform the appropriate test and fully state your results.

A factor in determining the usefulness of an examination as a measure of demonstrated ability is the amount of spread that occurs in the grades. If the spread or variation of examination scores is very small, it usually means that the examination was either too hard or too easy. However, if the variance of scores s moderately large, then there is a definite difference in scores between "better," "average," and "poorer" students. A group of attorneys in a midwestern state has been given the task of making up this year's bar examination for the state. The examination has 500 total possible points, and from the history of past examinations, it is known that a standard deviation of around 60 points is desirable. Of course, too large or too small a standard deviation is not good. The attorneys want to test their examination to see how good it is. A preliminary version of the examination (with slight modifications to protect the integrity of the real examination) is given to a random sample…

A If the computed value of variance and standard deviation is zero (0), this suggests that the data set are more dispersed has no variation less dispersed more varjed R If the researcher opted for a 97% accuracy of the result from the population of 525, the total number of respondents would be 356.5 356 357 357.5

One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance for these two samples?

Explain what would happen to the F ratio of this analysis of variance if 2 points were added to each score in Finals only group?  (Note:  The new scores would be 2, 4, 2, and 4 with T = 12 and SS = 4.)

1. Which of the following is consistent with the null hypothesis for the interaction of factors A and B in a two-factor analysis of variance?     a. The mean differences between treatment conditions are what would be predicted from the overall main effects of Factors A and B.   b. The mean differences between treatment conditions are not what would be predicted from the overall main effects of Factors A and B.   c. µA ≠ µB   d. µA = µB