Unit 1 AP Questions

This data set contains

• 7 variables, 2 of which are categorical

• 7 variables, 1 of which is categorical

• 6 variables, 2 of which are categorical

• 6 variables, 1 of which is categorical

• none of these

When comparing two distributions, it would be best to use relative frequency histograms rather than frequency histograms when

• the distributions have different shapes.

• the distributions have different amounts of variability.

• the distributions have different centers.

• the distributions have different numbers of observations.

• at least one of the distributions has outliers.

You look at real estate ads for houses in Naples,

Florida. There are many houses ranging from

$200,000 to $500,000 in price. The few houses

on the water, however, are priced up to $15

million.

The distribution of house prices will be

• skewed to the left.

• roughly Symmetric.

• skewed to the right.

• single-peaked.

• approximately uniform.

The partially completed two-way table shows the marginal distributions of gender and handedness for a sample of 100 high school students.

If there is no association between gender and handedness for the members of the sample, which of the following is the correct value of x?

• 20

• 30

• 36

• 45

• Impossible to determine without more information

If a distribution is skewed to the right with no outliers, which expression is correct?

• mean < median

• mean > median

• mean = median

• mean >= median

• We can't tell without examining the data.

Scores on the ACT college entrance exam follow

a bell-shaped distribution with mean 21 and

standard deviation 5. Gwen's standardized score

on the ACT was -0.6. What was her actual ACT

score?

• 3

• 13

• 16

• 18

• 24

Jorge's score on Exam 1 in his statistics class was at the 64th percentile of scores for all students. His score falls

• A. between the minimum and the first quartile.

• B. between the first quartile and the median.

• C. between the median and the third quartile.

• D. between the third quartile and the maximum.

• E. at the mean for all students.

The weights of laboratory cockroaches can be modeled with a Normal distribution having mean 80 grams and standard deviation 2 grams. The figure is the Normal curve for the distribution of weights.

Point C on the Normal curve corresponds to

• A. 84 grams.

• B. 82 grams.

• C. 78 grams.

• D. 76 grams.

• E. 74 grams.

Using the distribution for laboratory cockroaches in the previous question, about what percent of the cockroaches have weights between 76 and 84 grams?

• A. 99.7%

• B. 95%

• C. 68%

• D. 47.5%

• E. 34%