Chapter 1, Problem 1P

Essentials of Statistics for The B...

9th Edition
Frederick J Gravetter + 2 others
ISBN: 9781337098120

Chapter
Section

Essentials of Statistics for The B...

9th Edition
Frederick J Gravetter + 2 others
ISBN: 9781337098120

a.

To determine

To determine: The population for the given study.

Population is all the high school students in the United States.

Explanation

Explanation:

Given info:

A researcher is interested in the texting habits of high school students in the United States.

To measure the number of messages that each individual sends each day a group of 100 students is selected. Also, average of all texts messages is calculated.

Justification:

Since, the aim of the researcher is to check the texting habits of high school students in United States. Therefore, the populations consist of all high school students in the United States.

b.

To determine

To determine: The sample for the given study.

Sample consists of group of 100 students which were selected by the researcher.

Explanation

Explanation:

Given info:

A researcher is interested in the texting habits of high school students in the United States.

To measure the number of messages that each individual sends each day a group of 100 students is selected. Also, average of all texts messages is calculated.

Justification:

Since sample is the part of population. Also, it is used to make conclusions about population. In a given study, researcher selected a group of 100 students and measures the number of text messages sent by them individually.

Therefore, sample for this study is 100 students selected by researcher.

c.

To determine

To determine: The term used for average number that the researcher calculated.

The average number that the researcher calculated is an example of a statistic.

Explanation

Explanation:

Given Info:

A researcher is interested in the texting habits of high school students in the United States.

To measure the number of messages that each individual sends each day a group of 100 students is selected. Also, average of all texts messages is calculated.

Justification:

Since, researcher selected 100 students and measures the number of text messages that each individual sends each day. The researcher used the sample observations to calculate the average number of messages sends. Therefore, average is a function of sample observations; hence average number that the researcher calculated is an example of a statistic.

Concept

Parameter:

A parameter is a functional unit or a numerical characteristic obtained from a population.

Statistic:

Statistic is a numerical characteristic obtained from a sample. A sample is a subset or part of a population.

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