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Samples and Populations Statistics

Authored by Anthony Clark

Mathematics

7th Grade

Samples and Populations Statistics
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10 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Tom Ricketts wants to survey people who visit Wrigley Field and identify their favorite jersey the Cubs wear.  For his survey, the population is defined as all people who visit Wrigley Field in May.  The number of people in this population is large, so Tom realizes that he must choose a sample of the population to survey.  Which sample would be the best representation of the population?

A random sample of 100 fans who visited Wrigley Field on Sundays.

A random sample of 100 fans in the bleachers of Wrigley Field during May.

A random sample of 100 females who visited Wrigley Field during May.

A random sample of 100 people who visited Wrigley Field during May.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following methods would be appropriate for choosing a random sample of ten students from the 7th grade?

Choose 10 students from your lunch table.

Get a print out of all the students in 7th grade and choose every 10th student.

Assign every student a number and use a random number generator to select 10 numbers.

Choose the first 10 students to get to your PE class.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Students are surveyed about the average number of minutes they spend getting ready each morning.  Which sample size will most likely have the least amount of variability?

10

20

30

40

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Ben conducted a random sample of 20 students from his school to find out their favorite kind of pizza.  He found that 7 of the surveyed students prefer sausage.  What percentage of the students at Ben’s school are likely to prefer sausage pizza?

7%

25%

35%

77%

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Tyler picked a random sample of the students on his track team and surveyed their heights.  He found that the mean of their heights was 58 inches.  Choose the conclusion that would be most appropriate for Tyler to make.

The mean height of all random samples would be 58 inches.

The mean height of all students on the track team is likely to be close to 58 inches.

The mean height of all students on the track team is exactly 58 inches.

If  a smaller sample was chose, the mean age would be smaller than 58 inches.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The number of iTunes downloaded by 25 students in one week is displayed in the box plot.  What percent of students download more than 40 iTunes in the week?

25%

50%

75%

100%

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A population of students in 7th grade consists of 85 girls and 73 boys. A random sample of 20 students is chosen and the gender represented in each sample are shown below. What is the sample proportion of girls in this situation?

Boy, Boy, Girl, Boy, Girl, Girl, Girl, Boy, Girl, Girl, Girl, Boy, Boy, Girl, Girl, Girl, Boy, Girl, Boy, Girl

0.4

0.5

0.6

0.7

Answer explanation

12 DIVIDED BY 20

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