Stat 1.1-1.2 Quiz

A car loan application requires a person to give the following information: annual salary amount, length of time at current job, state issuing driver’s license, car insurance company, and number of years driving. Of these variables, which are categorical?

• annual salary amount, car insurance company

• state issuing driver’s license, car insurance company

• only car insurance company

• annual salary amount, length of time at current job, number of years driving

• None of these are categorical variables.

A used car dealership has the following inventory for different brands of cars. What percent of the cars are Japanese (Honda or Toyota)?

• 12%

• 21%

• 22.5%

• 30%

• 52.5%

The mosaic plot shows the relative frequency of each grade level for three varsity sports teams at a local high school. Which of the following statements must be true?

• For the basketball team, there were more 10th graders than 11th graders.

• There were fewer 12th graders on the volleyball team than 10th graders on the basketball team.

• For the football team, there are more 9th graders than any other grade level.

• There were the same number of 12th graders on the volleyball team as were on the football team.

• For the volleyball team, there were fewer 10th graders than 11th graders.

The following graph shows the percent of mobile phone users in the United States who have iPhone versus Android. Which of the following statements is false?

• There is a higher percent of mobile users that have iPhones than Androids.

• The percent of mobile phone users who have iPhone is more than double the percent of mobile phone users who have Android.

• The graph is misleading because the vertical axis does not start at 0%.

• The graph is misleading because the bars are being represented with images of different widths.

• Type of mobile phone is a categorical variable.

An online survey collected results from 100 people, who were classified by region and whether they preferred Chicago-style pizza or New York style pizza. Which of the following is true?

• For each region, more than half of the people in that region preferred New York style pizza.

• The percent of people who prefer Chicago style pizza is greater for people from the South than for people from the West Coast.

• More than half of the 100 people in the survey are from the East Coast and prefer New York style pizza.

• Of the four regions, people from the South had the highest proportion who preferred Chicago style pizza.

• Of the four regions, people from the East Coast had the highest proportion who preferred New York style pizza.

A recent study of 5,031 U.S. adults investigated the consumption rates for different types of content created by influencers and online content creators. The table and bar graph show the percent of adults surveyed who indicated they consume the content for each category. About how many adults in the survey indicated they consume content in the Music category?

• 500

• 1,000

• 1,500

• 2,000

Would it be appropriate to make a pie chart to display this data?

• Yes, because pie charts are suitable for showing proportions.

• No, because pie charts are not suitable for this type of data.

• It depends on the data being represented.

Mrs. Gallas’ AP Statistics class is wondering if Mrs. Gallas drinking coffee during first hour affects whether or not she remembers to play the morning announcements. For 55 days, the class tracks whether or not Mrs. Gallas drinks coffee during first hour and whether or not she remembers to play the morning announcements. The results are shown in the table. What is the main variable being investigated in this study?

• The number of students in the class

• Whether Mrs. Gallas drinks coffee

• The time of the morning announcements

• The subject Mrs. Gallas teaches

Identify the explanatory variable and the response variable.

• Explanatory variable: Time, Response variable: Growth

• Explanatory variable: Temperature, Response variable: Pressure

• Explanatory variable: Age, Response variable: Height

• Explanatory variable: Distance, Response variable: Speed

What percent of the days does Mrs. Gallas play the announcements?

• 10%

• 25%

• 50%

• 75%