Statistics and Data Review

Here’s a dot plot of a data set. Which statement is true about the mean of the data set?

• The mean is less than 5.

• The mean is equal to 5.

• The mean is greater than 5.

• There is not enough information to determine the mean.

The air quality was tested in many office buildings in two cities. The results of the testing is shown in these box plots. A level of less than 50 parts per million is considered healthy. A level of 50 or more parts per million is considered unhealthy. Select all the statements that must be true.

• The lowest recorded measurement was in city Q.

• All buildings tested in city P are in the healthy range.

• The mean for city P is greater than the mean for city Q.

• The range for city Q is greater than the range for city P.

• The median for city P is greater than the median for city Q.

This box plot displays information about the number of text messages some students sent one day. What is the median number of texts sent by students?

• 10

• 20

• 14

• 26

Mai drew two box plots to show the scores for two groups of friends who went bowling. Which group shows greater variability?

• The first group shows greater variability because it has a wider range (120) and a wider IQR (50).

• The second group shows greater variability because there is a longer bottom whisker.

• The groups have about the same variability, but the first group had higher scores overall.

Ten students each attempted 10 free throws. This list shows how many free throws each student made. What is the IQR (interquartile range)?

• 8

• 5

• 3

• 13

Jada asked some students at her school how many hours they spent watching television last week, to the nearest hour. Here is a histogram for the data she collected. About how many students did Jada ask?

• 30

• 40

• 100

• 15

Eva asked ten of her friends how many birthday cards they got for their most recent birthday. The responses were as follows: 3, 2, 1, 0, 3, 4, 2, 1, 0, 1 What is the mode?

Which of the following is the best example of a statistical question?

• How much money does the average architect make in a year?

• Who is the wealthiest person in the world?

• How long did it take to build the largest building in the United States?

• Where is the largest building in the United States?

What are the missing numbers in the data set? Assume the numbers are in order from least to greatest. _____, 20, 23, _____, 27 Mean = 22 Range = 11

• 16, 25

• 5, 35

• 16, 24

• 19, 25

Karly collected data about the number of hours students spend on the internet each week. She determined the five-number summary to be: 0.5 ~ 4 ~ 6 ~ 7.5 ~ 11 Which of the following statements are true? Choose all that apply.

• 50% of the people watched between 4 and 7.5 hours of TV.

• Nobody watched more than 11 hours.

• 75% of the people watched at least 4 hours of TV.

• The range of the data is 3.5 hours.

• Half of the people watched more than 6 hours.