Make More Comparative Inferences About Populations

The education board is analyzing the amount of time students spend on homework each night. They take a random sample of 10 students from each school. What can you infer using the measure of​ center?

• You can infer from the means that the students of School X spend the same amount of time on homework than the students of School Y.

• You can infer from the IQRs that the amount of time students spend on homework is fairly consistent within each school.

• You can infer from the IQRs that the amount of time students spend on homework varies significantly within each school.

• You can infer from the medians that the students of School X spend less time on homework than the students of School Y.

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

• 40

• 41

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 find the middle number of all the dots.

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

• The first step should be to average the minimum and maximum values that have dots.

The following dot plots show the ages of two groups of tourists. Make a comparative inference based on the mean values. The mean for group 1 is?

• 41

• 41.5

• 42

• 42.5

The following dot plots show the ages of two groups of tourists. Make a comparative inference based on the mean values. The mean for group 2 is?

• 46.5

• 47

• 47.5

• 48

Waldo and Freddy caught fish one weekend. The dot plots show the lengths of the fish they caught. Which statement about the lengths of the fish caught by Waldo and Freddy appears to be true?

• The range of the length of the fish caught by Freddy is greater than the range of the length of the fish caught by Waldo.

• The median length of the fish caught by Waldo is greater than the median length of the fish caught by Freddy.

The dot plots show the number of children's books purchased by customers at two differenct bookstores on one day. Which statement is supported by the information in the dot plots?

• The range of the data for Store 1 is greater than the range of the data for Store 2.

• The mean of the data for Store 1 is greater than the mean of the data for Store 2.

The dot plots show the heights of the players on two basketball teams. Which statement is best supported by these data?

• The distributions of the data for Team A and Team B are not correct.

• Team B has a greater range in player heights than Team A has.

A complete set of items being studied

• Subject

• Sample

• Population

• Bias