Introduction to Statistics — Unit test Answers

The five-number summary for the lengths of songs, in minutes, performed by a popular music group is given below.Minimum: 1.8 Q1: 3.3 Median: 3.8 Q3: 4.5 Maximum: 9.2 What is the IQR for the distribution of song lengths?

The histogram represents boiling temperatures, in degrees Celsius, of tap water and of a saltwater mix.The median boiling temperature of the tap water is 100°C. The median boiling temperature of the salt water is 102°C. Which statement about the means is most likely true?

The box plots show the data distributions for the number of text messages Will and Jaime sent each day.

A simple random sample of 10 people was asked how many first cousins they have. The results are listed below.10, 19, 20, 13, 13, 2, 10, 8, 25, 10

John has taken six quizzes in his statistics class. His scores on these quizzes are listed below. 71, 75, 76, 80, 85, 87

Which statements are true about the data used to create the histogram? Select three options.

The distribution of the salaries at a small business is strongly skewed with many people making very modest salaries and a few making very large salaries. Which measure of center, mean or median, is a better indication of a "typical” salary at this business?

IQ scores are collected from a sample of students at a large university. The scores are shown below.99, 100, 105, 104, 102, 105, 105, 121, 104

IQ scores are collected from a sample of students at a large university. The scores are shown below.99, 100, 105, 104, 102, 105, 105, 121, 104

Joe is interested in the prices of homes sold in his area. He found a list of the selling prices of 50 homes for the past month. Most of the homes sold for $100,000–$350,000, but there were a few that sold for more than $1,000,000. Which of the following statements is true about the mean and median selling price for the 50 homes?

The distribution of ages of runners in a marathon is approximately normal. The oldest participant was 80 and the youngest was 13. Which of the following statements is true of the mean and median ages of the runners?

A sample of 50 students was surveyed about their time spent in front of a screen (laptop, tablet, phone, etc.). Each interval contains the left endpoint but not the right endpoint.

Thirteen students in a statistics class were asked how many siblings they have. Their responses are listed below.0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 5, 5, 6Which of the following is the five-number summary for the data?

The boxplot below displays the arm spans for 44 students.

A 10-item statistics quiz was given to 30 students. The table below gives the scores received along with the corresponding frequencies.

Twelve people were surveyed and asked how many people live in their residence. The results are summarized in the table below.

Test scores for 26 students in an introductory statistics course are displayed in the stemplot below. The scores range from 72 to 98.

IQ scores are collected from a sample of 36 students at a large university. The scores are summarized in the histogram below.

A simple random sample of 14 students on a large university campus is asked to complete a survey. One of the questions on the survey asks for the number of credit hours for which they are currently enrolled. The results of the survey are shown below.12, 9, 13, 15, 12, 16, 19, 13, 12, 12, 16, 12, 14, 6