Chapter 8 Statistics OST Review (7th grade)

Which pair of data provides no evidence that the values of Set A are greater than the values of Set B?

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2016 #3

The leaders of two youth sports teams randomly select five members of each team and record their ages, as shown. - Team A: 16, 13, 12, 16, 13 - Team B: 10, 13, 16, 16, 10 Which statement appropriately compares the ages of the team members?

• Members of Team A and members of Team B are likely the same average (mean) age.

• Members of Team A are likely younger, and they have less variability in their ages.

• Members of Team A are likely older, and they have more variability in their ages.

• Members of Team A are likely older, and they have less variability in their ages.

Chris wants to determine the most popular sport of the students at his school.

Which sample should he survey?

• a group of his friends

• a group of students on the soccer team

• a group of randomly selected students from each grade at his school

• a group of randomly selected students from each sports team at his school

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2018 #33

Which data set show the most overlap?

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A pizza shop wants to determine how often it delivers to three different areas of a city. The table shows the areas from a random sample of 80 deliveries.

Based on these data, if the driver makes 200 deliveries, how many deliveries will be to the southern area of the city?

Mathematical Equivalence

ON

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Practice Test #15

Jerry grows two different types of oranges. He wants to know which type of orange weighs more. He takes a random sample of oranges from each type of tree and creates the dot plot show with their weights, in ounces.

Based on these data, which statement is true?

• It is certain that a Type B orange weighs more than a Type A orange.

• There is evidence that a Type B orange typically weighs more than a Type A orange.

• There is no evidence that a Type B orange weighs more than a Type A orange.

• The mean absolute deviation of the sample is less for a Type A orange than for a Type B orange.

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2019 #8

There are 300 students in 7th grade. Paul takes a random sample to find out which fall sport the students in 7th grade prefer. Which group of students represents the most valid sample?

• 10 of Paul’s closest friends

• 10 students from each grade

• 10 students from each 7th grade homeroom

• 10 students on the 7th grade basketball team

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2019 #11

A group of students plans to participate in a swimming competition. The students begin training with a coach one month prior to the competition. The dot plots shown represent the time they took to finish a 50-meter(m) lap before the start of the training and after training was completed.

Complete the sentence describing whether or not the training has an impact on the time taken by student to complete the lap and the evidence to support your answer.

A​ (a)   overlap between the distributions indicates that after one month of training, there is ​ (b)   in the time taken by students to complete a lap.

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• small
• large
• a significant decrease
• a significant increase
• no significant change.

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2021 #5

Dan surveys 10 of the 24 students in his class about the number of people in their families. The results of Dan's survey are given.

3, 3, 4, 3, 6, 5, 7, 3, 4, 2

Based on the results of Dan’s survey, what would be the best estimate for the mean number of people in students’ families in his class?

Mathematical Equivalence

ON

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2021 #7

A high school athletic director wants to know what the best time would be to schedule practices for all of the sports teams. She surveys the girls’ basketball team to get the players’ input. Which statement describes the athletic director’s sample?

• A. It is biased.

• B. It is unbiased.

• C. It is representative.

• D. It is the entire population.

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2022 #2