1) What do scatterplots portray?

a. The shape of the distribution.

b. Changes in the data over time.

c. The relationship between two variables.

d. The minimum and maximum values in a dataset.

2) The strength of the correlation of two variables with a correlation coefficient of -0.6 is less than that of two variables with a correlation coefficient of 0.3.

a. True

b. False

3) A cross-tabulation can only be used with categorical variables.

a. True

b. False

4) The probability in a continuous distribution is the height under the curve.

a. True

b. False

5) The normal distribution is bell shaped

a. True

b. False

6) In a normal distribution, the mean is less than the median, which is less than the mode.

a. True

b. False

7) 99% of the data in a normal distribution lies within 2 standard deviations of the mean.

a. True

b. False

8) Use the z-table

The test scores of 600 students are normally distributed with a mean of 76 and a standard deviation of 8. The number of students scoring 90 and above is:

a. 24

b. .0401

c. 1.75

d. 40