AP Exam Review 1

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

• A
• B
• C
• D

A random sample of 374 United States pennies was collected, and the age of each penny was determined.  According to the boxplot above, what is the approximate interquartile range (IQR) of the ages?

• 8
• 10
• 16
• 40

The hitogram 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 distributions appears to be normal.
• The distribution appears to be uniform.

A bank surveyed all of its 60 employees to determine the proportion who participate in volunteer activities.  Which of the following statements is true?

• The bank should not use the data from this survey because this is an observational study.
• The bank can use the result of this survey to proved that working for the bank causes employees to participate in volunteer activities.
• The bank did not select a random sample of employees, so the survey will not provide the bank with useful information.  
• The bank does not need to use an inference procedure to determine the proportion of employees who participate in volunteer activities because the survey was a census of all employees.

The histogram above 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