Math Statistics

Find the Mean. 

• 5.8

• 5

• 5.6

• 6

Manny wants to know how many students at CTMS enjoy solving math problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math problems

• ask the last 20 people to arrive at CTMS 

• Randomly ask 2 students in the hallway

• Ask every 20th student that walks into school

At a middle school, the 7th graders will conduct a survey for where to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the student council to choose a location

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

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

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