Applied Statistics From Bivariate Through Multivariate Techniques 2nd Edition Warner - Test Bank - Updated 2025

Chapter 2: Basic Statistics, Sampling Error, and Confidence Intervals

Multiple Choice

1. Which notation represents a population mean:

a. M

b. µ

c. z

d. s

Ans: a

2.Which notation represents a sample standard deviation:

a. M

b. µ

c. z

d. s

Ans: d

3. When different sets of data of the same size are randomly chosen from a population, the resulting variation in values is called ______.:

a. confidence interval

b. sampling error

c. standard deviation

d. magnitude of error

Ans: b

4. The formula for the sample mean is ∑X/N. When N increases and ∑X stays the same, the:

a. sample mean increases.

b. sample mean decreases.

c. population mean increases.

d. population mean decreases.

Ans: b

5. If a list of math exam scores is provided, what would the best estimate of a randomly selected student’s math score:

a. mode

b. median

c. mean

d. sum of the squared deviations

Ans: c

6. The inclusion of an extreme outlier will affect which statistic the most:

a. mode

b. median

c. mean

d. sum of the squared deviations

Ans: c

7. The mean, median, and mode are the same value for what type of distribution:

a. skewed

b. normal

c. uniform

d. triangular

Ans: b

8. What is the minimum value for the sum of the squared deviations:

a. -∞

b. -1

c. 0

d. ∞

Ans: c

9. The statistic calculated by summing the deviations, squaring the result, and then dividing by the sample size minus one is the sample:

a. standard deviation

b. variance

c. mean

d. median

Ans:b

10. The proportion of the area of a normal distribution greater than 12.1% is z=____. Use Appendix A of your textbook:

a. 0.30

b. 0.97

c. 1.17

d. 2.25

Ans: c

11. As N increases, the standard error of the mean:

a. increases