Unit 5 Review

Which of these is an example of a random sample?

• The manager of a baseball team asks his team members about their views on the previous game they played.

• Five players from a basketball team are chosen for a game.

• Three members of a band are chosen for a concert.

• For a survey on air travel, 100 people are chosen randomly from five different airports.

The manager of a toothpaste manufacturing company wants to add three new flavored toothpastes for children between the ages 6 and 12. The new flavors are lemon, ginger, and vanilla. The manager surveys 60 children between the ages 6 and 12. Of the children surveyed, 18 children prefer lemon flavor over the other ones. Identify the population in the situation above.

• all children

• all children between 6 and 12

• all adults

• all adult women

The store manager of a beauty store wants to know what brand of perfume adult women buy the most. The manager surveys 40 adult women (out of 85 total). Of the customers surveyed, 4 women buy perfume A, 11 women buy perfume B, and 9 women buy perfume C. Identify the population in the situation above.

• all adult women in the store

• all adult women surveyed

• all adult costumers

• all adult women

A jelly bean factory packaged 873 special ordered bags last Tuesday. The shift manager randomly picked seven bags to count the number of jelly beans.

8, 6, 10, 15, 6, 10, 6

If the sample was representative of all the bags packaged on Tuesday, what was the mode of the number of jelly beans of all the bags?

• 10

• 15

• 6

• 8

A new website was reviewed by 90 people. The creator of the website surveyed 8 of the reviewers at random. He asked them to rate the website on a scale from 1 to 10. Their ratings are below.

3, 8, 9, 5, 3, 9, 9, 5

Assuming that the sample was representative of all reviewers, what was the mean rating of the website for all reviewers?

• 6.7

• 6.25

• 5.99

• 6.375

For the last two years, a scientist has recorded the amount of rainfall in inches that London and Berlin received each month. The box-and-whisker plots below show the distribution of his data. What amount of rainfall represents the median for Berlin?

• 1.5 in

• 1.9 in

• 1.3 in

• 1.6 in

The dot plots below show the numbers of bird feeders in 16 different sections of two bird sanctuaries, Bird Paradise and Bird Safari.What is the difference between the median numbers of bird feeders at the two bird sanctuaries?

• 1

• 3

• 6

• 2

The box-and-whisker plots below show the distribution of prices (in thousands of dollars) of sports cars at two local dealerships. Which of the following statements is true?

• The lower extreme price at Dealer 1 is higher than the upper quartile price at Dealer 2.

• The lower extreme price at Dealer 1 is higher than the median price at Dealer 2.

• The upper extreme price at Dealer 1 is lower than the upper extreme price at Dealer 2.

• The median price at Dealer 1 is lower than the upper quartile price at Dealer 2.

Which of the following statements is true regarding the box-and-whisker plots above?

• The plots have different lower quartiles.

• The plots have different upper extremes.

• The plots have different upper quartiles.

• The plots have different medians.

For the last two years, a scientist has recorded the amount of rainfall that London and Berlin received each month. The box-and-whisker plots below show the distribution of his data. Which rainfall amount represents the median in London and the upper extreme in Berlin?

• 2.1 in

• 1.5 in

• 1.7 in

• 2.2 in