Exam 2: Picturing Variation With Graphs

The histograms below show the distribution of quiz scores on a ten point math quiz with and without a fifteen minute review before the quiz. Describe the different shapes of the distributions. Does it appear that the fifteen minute review resulted in improved quiz scores? Explain the evidence that supports your conclusion.

Data was collected on hand grip strength of adults. The histogram below summarizes the data. Which statement is true about the distribution of the data shown in the graph?

Based on the histogram below, would it be unusual to be on hold for at least 6 minutes at this call center?

Which type of take- out food is least popular? Is this easier to determine with the bar chart or with the pie chart? Why?

A group of junior high athletes was asked what team sport was their favorite. The data are summarized in the table below. On the pie chart, which area would correspond to the category "Soccer"?

About how many of the swim courses had a pass rate of 70% or better? The YMCA managers have set a goal for the summer that at least half the swim courses have a pass rate of at least 70%. Do you think that this YMCA is running a successful summer swim program? Why?

Write a sentence to compare color preferences or males and females.

The data in the histogram summarizes the pitch speed of a sample of 75 pitches for a college pitcher during one season. Which of the following statements best describes the distribution of the histogram below?

The graph below displays the number of applications for a concealed weapons permit in Montcalm County, Michigan, for each of three years. A reported interprets this graph to mean that applications in 2010 are more than twice the level in 2008. Is the reported making a correct interpretation?

What was the most common response for 1999?

Explain how to assess variability when presented with categorical data.

What percentage of college students preferred either Chinese or pizza? Is this easier to determine with the bar chart or with the pie chart? Why?

The distribution of heights of adult males tends to be symmetrical.

Find the original data set from the stemplot given below.

In which category was there more variability apparent?

What is the approximate percentage of participants had a heart rate less than 130 bpm?

Data was collected on the heights of a group of five boy scouts, between the ages of seven and eleven. The following heights were recorded in inches: 29, 60, 52, 57, 52. Choose the true statement:

How many participants had a heart rate between 140 and 150 bpm?

The library does not want patrons to wait in line. Usually, a line develops when a computer is used more than 40 times in a day. What percent of days did this occur? Round to the nearest whole percent.

The distribution of the numbers of times individuals in the 18- 24 age group log onto a social networking website during the course of a day tends to be right- skewed.