Has a čláss with four recitation sections. Each section has 7 students (rare, but there are exactly the same number in each clas...how convenient for our purposes, yes?). At first glance, the professor has no reason to assume that these exam scores from the first test would not be independent and normally distributed with equal variance. However, the question is whether or not the section choice (different TAs and different days of the week) has any relationship with how students performed on the test. Group-1 Group-2 Group-3 Group-4 76.9 60.5 75.5 70.7 78.1 71.3 78.7 102.2 71.4 54.5 80.1 67.3 72.6 56.1 82.8 89.5 74.1 71.8 68.1 72.9 68.9 68.1 81.7 70.5 67.6 62.2 68.8 92.1

. What are the values of SS and variance s? for the following sample of n=3 scores? Sample: 1, 4, 7

and if the scores A set of 10 scores has SS= 90. If the scores are a sample, the sample variance is are a population, the population variance is O 2 - 10: ? = 10

The role of the covariate is to:     a.Compare variables of interest without a nuisance variable masking true differences. b.Reduce within-wroup error variance and help eliminate confounding variable bias. c.To determine the predictive power of the independent variable using odds d.A & B

If two large random samples are drawn from two populations, each having a mean of $100, the relevant sampling distribution of their difference has a mean of a. 200 b. The Sum of the 2 Sample Means C. 0 D. The difference between the two sample means.