Chapter 11 Retake - Thompson

A restaurant owner wants feedback on the items on the menu, so she leaves a customer satisfaction survey on the tables for customers to complete if they wish. Which sampling method best describes this scenario?

• convenience sample

• simple random sample

• stratified random sample

• voluntary response sample

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11.1

The manager of the school bookstore needs to order school shirts to restock the shelves. In order to determine how many of each kind to purchase, she randomly surveys 50 students and faculty members who pan to buy shirts about which type of shirt they would buy. The manager plans to order a total of 250 school shirts. Based on the survey results, predict how many sweatshirts she should order.

_____ sweatshirts

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11.2

A language arts teacher at Patton Middle School conducts a random survey of the student body and finds that 15% of the students would be interested in a summer creative writing program if it were offered. If there are 720 students in the school, how many of them should the teacher predict will participate in the program?

• 15 students

• 84 students

• 108 students

• 115 students

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11.2

In order to analyze how much time middle school students typically spend playing outside each day during the summer, a teacher takes 18 random samples of 25 students each. The graph shows the mean of each sample, rounded to the nearest half hour. Which number of hours best represents the mean amount of time spent playing outside each day during the summer?

​ (a)   hours

• 2.7
• 2.3
• 2.5
• 3

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11.3

Mr. Cameron is shopping for a new refrigerator. The double dot plot shows the costs (rounded to the nearest $50) of several models at two different appliance stores. Which of the following statements are true about the distributions of the data? Select all that apply.

• Both distributions are symmetric.

• The prices at the Appliance Outlet are generally lower than at Appliances & More.

• All prices at Appliances More are higher than all the prices at the Appliance Outlet.

• The mean price at Appliances & More is higher than the mean price at the Appliance Outlet.

• The prices at Appliances & More have a higher variability than the prices at the Appliance Outlet.

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11.5

True or False:

MAD stands for Mean Absolute Deviation.

• true

• false

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11.5

Consider the sampling method described below.

Students at a middle school are divided into 6th, 7th, and 8th grades. A random sample of 15 students from each grade is chosen.

Which sampling method best describes this scenario?

• simple random sample

• stratified random sample

• systematic random sample

• voluntary response sample

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11.1

Katrina wants to find out the favorite day of the week of students at her school. Katrina's school has 75 sixth-graders, 50 seventh-graders, and 100 eighth-graders. Katrina selects her sample by mixing the students' names in a box and choosing approximately every fourth student for her grade. Her sample result is 18 sixth-graders, 12 seventh-graders, and 24 eight-graders. Select all the reasons that this sample is a good representation of the whole school.

• The sample is random.

• The sample includes students in each grade.

• There is an even number of students in each grade.

• The number of students at each level is proportional to the number in the school.

• The number of students is as small as possible while also including all grade levels.

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11.1

To find the median, you add up all the numbers, hit enter, then divide by the total number of entries.

• true

• false

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11.5

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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11.1