Make Comparative Inferences About Populations

The following box plots display how fast two different types of animals can run. Compare the median of each box plot.

• The medians are about the same.

• Animal 1 has a greater median.

• Animal 2 has a greater median.

There are two types of plants in a greenhouse. The following dot plots show the heights of 20​ plants, 10 of Type 1 and 10 of Type 2. The plants are given the same amount of food and water and grow at the same rate. What is the mean height for Type 2?

• 38

• 39

The following dot plots show the ages of two groups of tourists. Make a comparative inference based on the mean values. What is the first step for calculating the mean?

• The first step should be to count the ages that have dots and just average those numbers.

• The first step should be to count the number of dots for each age

The following box plots show the frequency of test scores on a recent math test in two classes. Make a comparative inference about the populations based on the IQR. Choose the correct answer below. ?

• Class 1 has more varied class scores.

• Class 2 has more varied class scores.

• Class 1 has more consistent class scores.

• Both classes have equality consistent scores.

What inference can you draw from this survey?

• I can infer that most students in this school like pizza.

• I can infer that very few students like hamburgers.

• I can infer that their favorite is corn dogs.

• I can infer that most students in this school like hamburgers.

The table shows the results of a survey of 200 people attending a hockey game.
The attendance for the hockey game is about 25,000 visitors each game.  Based on the table, how many people out of 25,000 could be expected to buy a pennant?

• 1,375

• 1,650

• 2,750

• 3,850

The table shows the finish times of 30 runners in the 100-meter dash. Which inference is true?

• The runners ran faster this year, on average, as compared to last year.

• Most runners ran faster last year, on average, as compared to this year.

• Every runner ran faster this year as compared to last year.

The table shows the finish times of 30 runners in the 100-meter dash. Which inference is true?

• The runners ran faster this year, on average, as compared to last year.

• Most runners ran faster last year, on average, as compared to this year.

• Every runner ran faster this year as compared to last year.

A travel club has 3,000 members. A random sample of 50 of the club members found that 12 people like mountain vacations best. Which statement is NOT supported by the sample data?

• Twenty-four percent of those sampled say they like mountain vacations best.

• An estimated 720 club members would likely say they enjoy mountain vacations best.

• Almost one-quarter of club members would likely say they enjoy mountain vacations best.

• More than 2,500 club members would likely say they prefer other vacations over mountain vacations.

There are two movie theaters in a town. A student wants to compare the amount of money each theater makes over a period of days. The following box plots show the data for the amount of money each theater makes over a period of days. Compare the median of each box plot.

• The medians are about the same.

• Theater 1 has a greater median.

• Theater 2 has a greater median.