Inferences

The dot plot represents the number of dollars in allowance that students receive each week in Mrs. Jimenez's class. What is the median amount of allowance?

• 5

• 6

• 7.5

• 8

A random sample of 40 students from each grade level was surveyed regarding their preference for a class field trip. If there are 220 members of the 7th grade class, then how many students can be expected to prefer the zoo?

• 39

• 48

• 120

• 66

Compare. Which of the following statements is NOT true?

• Class B has a higher average of siblings

• Class A has a greater variability in the number of siblings

• Both Class A and Class B have students who are only children.

• Over half of the students in Class A have two or more siblings.

Which of the conclusions best supports the dot plots?

• Both Jamal and Kendall's racecars had an equal spread in their data

• On average Kendall's racecar traveled futher.

• The median of Jamal's racecar traveled was 6.5 ft.

Which of the following statements does NOT represent the data?

• The scores in Mrs. Hernandez's class have less variability than the scores in Mrs. Moore's class

• The mean of Mrs. Moore's class is equal to the first quartile of Mrs. Hernandez's class.

• The interquartile range of both classes is equal.

Seventeen out of 20 teens said they eat breakfast every morning. What is a reasonable prediction for the number of teens out of 1,280 who eat breakfast every morning?

• 256

• 448

• 1088

• other

If Mr. Estes looked at the means (averages) for the last SAFE Quiz for his classes, and the averages were 72%, 71%, and 74%, what inference can you make based on those averages?

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• 15

• 27

• 45

• 75

Group A and Group B were randomly sampled from the same population. Which statements below are true? Select all that apply.

• Group A has a greater median than Group B

• Group A has a greater range than Group B

• Group A has greater variability than Group B

• Group B has a greater median than Group A

• You cannot tell which group has the greater median based on the picture.

Keyli gathers the heights of a random sample of six graders and seventh graders and displays the data in box plots. What can she say about the data sets?

• The 6th grade sample has greater variability.

• The 7th grade sample has greater variability.

• The 6th grade sample has the greater median.

• The ranges are equal for both samples.