Data and Statistics Math

Compare the variability of the seventh and eighth grade data sets.

• The seventh grade is more variable because the interquartile range is larger than the eighth grade.

• The eighth grade is more variable because their quartile 2, 3 and 4 are less than the seventh grade.

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7.SP.3

The principal at Key North Middle School wants to determine if the 85 students in the 7th grade prefer to collect bottles or sell magazines as their year-end trip fundrasier. Select ALL the sets of people that could be a representative sample of the population.

• 10 sixth-grade students, 10 seventh-grade students, 10 eighth-grade students

• 40 students from the school

• 30 seventh-grade students

• 10 seventh-grade boys and 10 teachers

• 15 seventh-grade boys and 15 seventh-grade girls

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7.SP.1

Kayla randomly surveyed the eighth-grade classes at her school and found that 12 of 50 own a pet. Based on these data, how many of the 150 eighth-grade students in Kayla's school would be expected to own a pet?

• 36

• 130

• 3

• 30

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7.SP.2

Peter randomly surveys people at a shopping center about the type of home they live in. If Peter randomly surveys another 300 people, how many would he expect to live in an apartment?

• 11

• 132

• 72

• 96

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7.SP.2

What conclusion can you draw about how much time seventh and eighth graders spend reading each week?

• All seventh graders read more than eighth graders.

• On average, seventh graders read more than eighth graders.

• The people who read the most are all in eighth grade.

• There is not enough information in a box plot to draw any conclusions.

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7.SP.3

Which group runs more kilometers per week, in general?

• soccer players

• basketball players

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7.SP.3

Which data set shows more variation?

• soccer players

• basketball players

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7.SP.3

The dot plot shows a random sample of the number of deer observed by 25 participants during a two-day hike. Which day showed more variability?

• Day 1

• Day 2

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7.SP.3

Carter's data comparing the growth of plants using fertilizer or not using fertilizer is shown in the box plots. Use the measures of center from the box plots to make an inference about the data.

• The plants that received fertilizer have a higher median, so they grew better overall.

• The plants that did not receive fertilizer had a larger interquartile range, so they grew better overall.

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7.SP.3

Which inference can you make by comparing the measures of center?

• Every swimmer swam faster last year than they did this year.

• Most swimmers swam faster last year, on average, than they did this year.

• The swimmers swam faster this year, on average, than they did last year.

• Every swimmer swam faster this year than they did last year.

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7.SP.4