9.A data set has only positive values. If the largest value of a data set is doubled, which of the following is not true?
10.If the test scores of a class of 30 students have a mean of 75.6 and the test scores of another class of 24 students have a mean of 68.4, then the mean of the combined group is
11.The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample mean and sample median are respectively: A.170, 169 B.170, 170 C.169, 170 D.176, 169 E.176, 176
12.If a distribution has zero variance, which of the following is true?
13.Which of the following is a measure of variation?
14.Given the following set of numbers, what is the variance? 15 20 40 25 35
15.A set of data is found to have a sample standard deviation of 25. Suppose that 6 is added to each of the numbers in the data set. What can you say about the standard deviation of the new data set? A.It will be unchanged. B.It will increase by 6. C.It will increase by 36. D.It will increase by