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Chapter 1: Q 1.10 (page 13)

1.10 The registrar at State University keeps records of the number of credit hours students complete each semester.

The data he collects are summarized in the histogram. The class boundaries are 10 to less than 13, 13 to less than 16,

16 to less than 19, 19 to less than 22, and 22 to less than 25.

Short Answer

Expert verified

The histogram shows quantitative data.

Step by step solution

01

Step 1. Introduction

Quantitative data are the result of counting attributes of a population. These are always numbers.

Some examples are amount of money, pulse rate, weight, number of people living in your town, and number of students who take statistics. Quantitative data may be either discrete or continuous.

02

Step 2. Explanation

Histograms are used to display quantitative data: credit hours completed. Because students can only complete a whole number of hours (no fractions of hours are allowed), this data is quantitative discrete.

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Most popular questions from this chapter

A scholarly article about response rates begins with the following quote:

鈥淒eclining contact and cooperation rates in random digit dial (RDD) national telephone surveys raise serious concerns about the validity of estimates drawn from such research.鈥�[6]The Pew Research Center for People and the Press admits: 鈥淭he percentage of people we interview 鈥� out of all we try to interview 鈥� has been declining over the past decade or more.鈥�[7]

a. What are some reasons for the decline in response rate over the past decade?

b. Explain why researchers are concerned with the impact of the declining response rate on public opinion polls.

Describe the unethical behavior, if any, in each example and describe how it could impact the reliability of the resulting data. Explain how the problem should be corrected. A study is commissioned to determine the favorite brand of fruit juice among teens in California.

  1. The survey is commissioned by the seller of a popular brand of apple juice.
  2. There are only two types of juice included in the study: apple juice and cranberry juice.
  3. Researchers allow participants to see the brand of juice as samples are poured for a taste test.
  4. Twenty-five percent of participants prefer Brand X, 33% prefer Brand Y and 42% have no preference between the two brands. Brand X references the study in a commercial saying "Most teens like Brand X as much as or more than Brand Y."

For the following exercises, identify the type of data that would be used to describe a response (quantitative discrete, quantitative continuous, or qualitative), and give an example of the data. percent of body fat

1.21 You are concerned about the effects of texting on driving performance. Design a study to test the response time

of drivers while texting and while driving only. How many seconds does it take for a driver to respond when a leading

car hits the brakes?

a. Describe the explanatory and response variables in the study.

b. What are the treatments?

c. What should you consider when selecting participants?

d. Your research partner wants to divide participants randomly into two groups: one to drive without distraction and

one to text and drive simultaneously. Is this a good idea? Why or why not?

e. Identify any lurking variables that could interfere with this study.

f. How can blinding be used in this study?

For the following exercises, identify the type of data that would be used to describe a response (quantitative discrete, quantitative continuous, or qualitative), and give an example of the data.

53. number of tickets sold to a concert.
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