Statistics

Statistics

Chapter 7 Quiz

1. What is the average of the squared differences from the mean? a. Variance

b. Standard deviation c. Confidence interval d. Standard error of the mean

2. Given the following sample information; SD = 25; mean = 40; n=32; and t = 2.045 (for 95% CI, P < 0.05): Calculate the degrees of freedom. a. 32 b. 435

c. 31 d. 5.7

3. From the above information, calculate the SEM. a. 1 b. 0.78

c. 32 d. 4.4

4. Using the same data set above: find the 95% confidence interval. a. 31 to 49 b. 65 to 109

c. 25 to 27 d. 33 to 47

5. If you are given a population variance of 169, what is the standard deviation of the population? a. 84 b. 13 c. 99 d. Cannot be determined

Answer key is found on page 84.

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