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Chapter 1: Q. 51 (page 53)

Consider the following:

X = number of days a Lake Tahoe Community College math student is absent

In this case, X is an example of a:

a. variable.

b. population.

c. statistic.

d. data.

Short Answer

Expert verified
ThenumberXrepresentsthenumberofdaysthatLakeTahoeCommunityCollegestudentshavebeenabsent.
It's a variable that changes at random.
As a result, option A is right.

Step by step solution

01

Introduction

The number of days absent is a random number that is kept in X.
As a consequence, X is turned into a variable.
02

Explanation

Xis a variable that represents the number of absences.
So Xcan be any integer and is assigned at random.
We didn't know its value before; all we knew was that it had to be a whole number because it represented the number of absences.

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Most popular questions from this chapter

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

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

Use the following data to answer the next five exercises: Two researchers are gathering data on hours of video games played by school-aged children and young adults. They each randomly sample different groups of 150 students from the same school. They collect the following data.

Researcher A concludes that most students play video games between four and six hours each week. Researcher B concludes that most students play video games between two and four hours each week. Who is correct?

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

Use the following information to answer the next two exercises: A study was done to determine the age, number of times per week, and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed.

“Number of times per week” is what type of data?

a. qualitative

b. quantitative discrete

c. quantitative continuous

A fitness center is interested in the mean amount of time a client exercises in the center each week.
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