Introduction to Statistics — Unit test Answers

One drive-through car wash facility offers three different types of washes: basic, deluxe, and supreme. The manager of the car wash facility tallies customer selections over three days. Type of Car Wash BasicDeluxeSupremeTotalDayFriday15431977Saturday275222101Sunday23451987 Total6514060265Given that a customer got their car washed on Friday, what is the probability that the customer selected the deluxe car wash?

Alex records the running time—the number of minutes a movie lasts from start to finish—of 50 popular movies. The distribution of times, in minutes, is shown in the histogram below.

Auto racing is a sport enjoyed by many people. In each race, there may be up to 25 cars on the racetrack. Which of the following is NOT an example of a quantitative variable you might use to describe a car in a race?

An airline uses many different types of airplanes. The table below shows some of the attributes of the different airplanes.What are the individuals in the data set?

A large city offers many venues for watching a concert. A listing of concert venues for the city includes the following information: the number of seats, the age of the venue, the number of nearby parking spaces, and the location of the venue (inside or outside). Which of the following is a categorical variable?

A veterinarian is visited by many pets and their owners each day. Before the doctor attends to each pet, an assistant records information including the type, age, weight, and height of each pet. Which of the variables is a categorical variable?

A golf course has 18 holes. A guidebook provided to golfers includes useful information about each hole, as shown below.

The relative frequency table displays the percentage of responses of students who were asked, "What caffeinated drinks do you consume?"CoffeeTeaSodaEnergy drink0.830.750.750.25The picture graph below displays the results of the survey.Is this graph misleading?

A scientist is studying the characteristics of butterflies and collects a random sample of butterflies to measure. Information regarding the wingspan of the butterflies is shown in the histogram below.

A college student would like to investigate the prices of large sandwiches offered near college campuses. Two random samples of 50 shops that sell sandwiches near the campuses of two colleges were taken and the price they charge for a large sandwich was recorded. One sample was taken for shops near City College, and one sample was taken for shops near Main Line University. The results are displayed in the cumulative relative frequency histograms below.Which is a correct comparison of sandwich prices based on the histograms?

A manager of a grocery store collects data on each shopper who uses the self-checkout lanes on a Saturday morning. Which of the following is an example of a discrete quantitative variable that might be recorded in this setting?

A state tourist guide provides information on summer vacation towns. Some of the towns and related information are given in the table below.What are the individuals in the data set?

An appliance store sells microwave ovens and has many different styles to choose from. A handout from the store contains details about brand, price, number of power settings, and color. What are the individuals in this data set?

An appliance store sells microwave ovens and has many different styles to choose from. A handout from the store contains details about brand, type (countertop or over-range), number of power settings, and color. Which of the variables is a discrete quantitative variable?

A tourist guide for a state provides information on summer vacation towns. Some of the towns and related information are given in the table.Which of the variables is a discrete quantitative variable?

A student stands at the entrance of her school and notes the colors of cars that enter the parking lot. The results are shown in the bar graph below.

A manager of a basketball team collects information on the profile and performance of the players on the team. Which of the following is an example of a continuous quantitative variable the manager might collect?

Many people enjoy taking cruises for their vacations. Each cruise ship has different options and features. Which of the following is an example of a continuous quantitative variable that might be reported about each cruise ship?