populations and sample inferences

1. For a class assignment, Tyler will conduct a survey to find out what students like to do after school. He asks the first 10 people he sees in the gymnasium before school what they like to do after school. Which statement correctly explains whether Tyler's sample is a random sample?

• Tyler’s sample is not random because he only asks 10 people

• Tyler’s sample is random because he asks the first 10 people he sees.

• Tyler’s sample is not random because he asks people in a gymnasium.

• Tyler’s sample is random because he asks each person the same question

Andre wants to survey a random sample of the student body in his school to find out which day after school would work best for students to do volunteer work for a local charity. Which sample would best represent the student body?

• asking twenty students waiting in line for lunch

• asking one person from the seventh grade daily for twenty days

• asking twenty students on their way to the bus after school

• asking one person each from twenty different classrooms during the first class period

Lee will conduct a survey at his school. He will select a random sample of students at the school to take the survey. Which sample is the best random sample for Lee to use?

• Every other student in the drama club

• every student who rides the same bus as Lee

• every fourth student in Lee’s homeroom class

• every fifth student who enters the school

Customers in two randomly selected groups at a yogurt shop are asked their preference of yogurt flavors. The responses for the customers in each group are summarized in the table above.

Based on the information shown in the table, which statement best describes the preferences of the customers in the two groups?

• In both groups, more customers prefer peach-flavored yogurt than either of the other two flavors.

• In both groups, fewer customers prefer vanilla-flavored yogurt than either of the other two flavors.

• In group 2, the same number of customers prefer strawberry-flavored yogurt and vanilla-flavored yogurt.

• In group 1, more customers prefer either strawberry-flavored yogurt or vanilla-flavored yogurt than peach-flavored yogurt.

An Italian restaurant asked 150 random customers what type of pasta they preferred. Results are shown in the table given. The restaurant is going to order 500 boxes of pasta, approximately how many should be linguine?

• 240 should be linguine

• 70 boxes should be linguine

• 60 should be linguine

• 130 should be linguine

An ice cream shop surveyed 200 random customers to find out which new ice cream flavor they enjoy the most. Results are shown in the table to the left. If there are 1,400 customers in a given week, how many would you expect to prefer chocolate strawberry or very berry mix?

• 280 customers

• 490 customers

• 252 customers

• 770 customers

A fitness center asked 80 random patrons how long they

exercise on average each day. Results are shown in the table to

the left. If 300 people come to the gym on a given day, approximately how many would you expect to exercise for more than 135 minutes?

• 15 people

• 72 people

• 120 people

• 214 people

Stan is the record keeper for the football team. He records the points scored in each game. Given the information below, what is the average(mean) number of points scored in that set of games?

Points scored in the last 8 football games:

{42, 35, 12, 20, 30, 18, 21, 30}

• 26 points

• 19.75 points

• 23.5 points

• 19.625 points

The rounded total spent by the last 12 people

checking out at the grocery store are listed : {14, 26, 98,

74, 55, 35, 104, 9, 46, 55, 26, 76}

What is the median amount spent on groceries by this group?

• $46

• $50.50

• $55

• $64.50

What is the median number of storms that occurred during this time period? What is the mean number of storms that occurred during this time period?

• Mean = 16

  Median = 19

• Mean = 16

  Median = 16

• Mean = 19

  Median = 19

• Mean = 25

  Median = 16