AP Stats Unit 2

• A

• B

• C

• D

• E

• II only

• I and II

• I and III

• II and III

• I, II, and III

• A

• B

• C

• D

• E

A survey of 57 students was conducted to determine whether or not they held jobs outside of school. The two-way table above shows the numbers of students by employment status (job, no job) and class (juniors, seniors). Which of the following best describes the relationship between employment status and class?

• There appears to be no association, since the same number of juniors and seniors have jobs.

• There appears to be no association, since close to half of the students have jobs.

• There appears to be an association, since there are more seniors than juniors in the survey.

• There appears to be an association, since the proportion of juniors having jobs is much larger than the proportion of seniors having jobs.

• A measure of association cannot be determined from these data.

Data were collected on the amount, in dollars, that individual customers spent on dinner in an Italian restaurant. The quartiles for these data are given below. Which of the following statements must be true for these customers?

• At least half of the customers spent less than or equal to $44.27 and at least half spent greater than or equal to $44.27.

• Seventy-five percent of the customers spent between $36.27 and $58.97.

• Twenty-five percent of the customers spent less than or equal to $58.97 and the remaining 75 percent spent greater than or equal to $58.97.

• The mean amount spent by customers is $44.27.

• A majority of customers spent $44.27.

Which of the following statements is NOT justified by these data?

• The drop-out rate decreased in each of the 49 high schools between the 1989-1990 and 1992-1993 school years.

• For the school years shown, most students in the 49 high schools did not drop out of high school.

• In general, drop-out rates decreased between the 1989-1990 and 1992-1993 school years.

• The median drop-out rate of the 49 high schools decreased between the 1989-1990 and 1992-1993 school years.

• The spread between the schools with the lowest drop-out rates and those with the highest drop-out rates did not change much between the 1989-1990 and 1992-1993 school years.

Of the following dotplots, which represents the set of data that has the greatest standard deviation?

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According to the boxplot below, what is the approximate interquartile range (IQR) of the ages?

• 8

• 10

• 16

• 40

• 50

The histogram above shows the number of minutes needed by 45 students to finish playing a computer game. Which of the following statements is correct?

• The distribution is skewed to the right.

• The distribution is skewed to the left.

• The distribution appears to be normal.

• The distribution appears to be chi-square.

• The distribution appears to be uniform.

The histogram below displays the frequencies of waiting times, in minutes, for 175 patients in a dentist’s office. Which of the following could be the median of the waiting times, in minutes?

• 2.50

• 7.25

• 12.25

• 15.00

• 17.50