Make More 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.

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

Identify the cluster of the data.

• 2 - 4

• 1 - 4

• 6 - 9

• 8 - 9

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.

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.

The manager of a music store surveyed a random sample of customer who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music. Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

• They are certain to select rock or pop music.

• They are less likely to select country or rap music than rock music.

• They are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.

The manager of a music store surveyed a random sample of customer who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music. Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

• They are certain to select rock or pop music.

• They are less likely to select country or rap music than rock music.

• They are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.

A representative sample of 80 customers in a clothing store was surveyed about how they paid for their purchases. The table shows the responses. Based on the results, which of the following are valid inferences. Select two answer choices.

• Tomorrow, 8 out of the first 80 customers will for sure pay with a gift card.

• In a group of 40 customers, it is expected that about 10 will pay with cash.

• About 30% of all the store's customers will pay with a credit card.

• A sample of 100 customers would provide less reliable data.

The following box plots show the frequency of test scores on a recent math test in two classes. What is the interquartile range​ (IQR) of the test scores for Class 1?

• 35

• 40

• 45

• 50