Boxplots and Outliers — Unit test

Question 1

The fuel economies in miles per gallon (mpg) for nine vehicles are listed below.16, 18, 20, 24, 24, 24, 24, 31, 32

Revolt · Accepted Answer

The mean will increase and the median will not change.

Question 2

The scores for 21 students on an exam are summarized in the stemplot below.

Revolt · Accepted Answer

The mean will increase but the median will be unchanged.

Question 3

The stemplot below displays the grades (out of 30) that 26 students received on a quiz.Which of the following boxplots correctly displays the distribution of quiz grades?

Revolt · Accepted Answer

A boxplot. A number line labeled quiz grades goes from 12 to 30. Points are at 12, 14, 15, and 16. The whiskers range from 20 to 30, and the box ranges from 23 to 27. A line divides the box at 25.

Question 4

High school students were asked if they preferred fiction or nonfiction books. The results are displayed below.

Revolt · Accepted Answer

There is no association because the distribution of genre preferences is the same among the grade groups.

Question 5

An arena manager tallies the number of snack items (hot dogs, nachos, and popcorn) sold at each of three concession stands in the arena. Snack Item Hot DogsNachosPopcornTotalConcessionStandsStand A1256540230Stand B21811952389Stand C655213130 Total408236105749What is the probability that a customer purchased popcorn, given that they purchased from stand B?

Revolt · Accepted Answer

13.4%

Question 6

A family visits a car show to research information on vehicles they might consider purchasing. Brochures for each vehicle provide helpful information for the vehicle. Which of the following is an example of a continuous quantitative variable that might be included in the brochure?

Revolt · Accepted Answer

fuel efficiency (in mpg)

Question 7

A waitress wondered if there was an association between the type of food and the type of drink customers ordered. The results are displayed below.Based on the graph, is there an association between food ordered and drink ordered?

Revolt · Accepted Answer

There is an association because the distribution of drinks ordered differs among the food groups.

Question 8

As an introduction to probability, a student is asked to roll a fair, six-sided number cube seven times. The results of those seven rolls are shown below.1, 4, 4, 4, 4, 6, 5

Revolt · Accepted Answer

1

Question 9

A statistics student gave a survey to students which asked how many first cousins they have. The data from the first nine responses are shown below.6, 2, 7, 8, 8, 8, 5, 10, 10

Revolt · Accepted Answer

2.52 first cousins

Question 10

Vehicles passing over a bridge have two options for paying their bridge toll: paying with a live cashier or using a Speed Pass device affixed to the dashboard. Data on a busy day for cars and trucks passing over the bridge are shown here. Payment Method Live CashierSpeed PassTotalVehicle TypeCar3567102Truck184765 Total53114167What percentage of vehicles are trucks, given that they use Speed Pass?

Revolt · Accepted Answer

41.2%

Boxplots and Outliers — Unit test Answers

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