Statistics -7th grade (topic 6)

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

Isaiah wants to know the most common style of skateboard used at the skate park. He surveys skateboarders at the park between 3 p.m. and 8 p.m. on Monday. Select ALL the statemetns that are true about Isaiah's survey.

• The population for the survey is all people who skateboard anywhere.

• Isaiah will obtain a random sample by talking to as many skateboarders as possible.

• Isaiah will not get a representative sample.

• The population for the survey is the people who skateboard at the skate park.

• Isaiah's sample is all people who skate at the skate park.

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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

The food service manager at a school conducted a random survey of students to determine their preference for new lunch menu items. Select ALL the inferences that can be drawn from the manager's data.

• About twice as many students prefer pita sandwiches as those who prefer burritos.

• Burritos are the most preferred item.

• Almost half of the students preferred pita sandwiches

• About half as many students prefer the salad bar as those who prefer burritos.

• Twice as many students prefer pizza as those who prefer pita sandwiches.

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7.SP.2

A random survey of seventh- and eighth-grade students was conducted to find how many hours they spent reading per week. Of the two sets of data, which has the greater median?

• 7th grade

• 8th grade

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7.SP.3

Compare the interquartile ranges of the data sets.

• The interquartile range of both sets is equal to 1 hour.

• The interquartile range for the eighth-graders is greater than the interquartile range for seventh-graders.

• The interquartile range for seventh-graders is greater than the interquartile range for eighth-graders.

• The interquartile range for seventh-graders is equal to the interquartile range for eighth-graders.

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7.SP.3

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

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