# STAT 200-Mastry Quiz 2 solutions

In a statistical study the population is

A) the group of people from which the sample is taken

B) all of the people in the United States

C) all of the people in the world

D) the people who comprise the sample

Feedback: The population is the larger group of people from which the sample was taken

Points Earned: 0.0/1.0

Correct Answer(s): A

2.

The sample mean is an estimate of:

A) The average value for people NOT in the population

B) The average value in the sample

C) The true population mean

Feedback: The sample mean is an estimate of the true population mean. It is, however, an exact measurement of the average value in the sample since the sample data is what is used to calculate the sample mean.

Points Earned: 0.0/1.0

Correct Answer(s): C

3.

A summary measure calculated from the sample is called a(n):

A) parameter

B) statistic

C) outlier

Feedback: Sample measures are statistics; population measures are parameters

Points Earned: 1.0/1.0

Correct Answer(s): B

4.

Which of the following is a parameter?

A) mu

B) x-bar

C) p-hat

D) Z

Feedback: x-bar and p-hat are sample statistics while Z is a test statistic.

Points Earned: 0.0/1.0

Correct Answer(s): A

5.

Which of the following is an example of paired data?

A) The average time to cook the same meal is compared for men and women.

B) The proportion of children that get a cold in Winter in Pittsburgh is compared to the proportion of children that get a colding in Winter in Dallas.

C) A researcher wants to test the time it takes to send a text message for adults and children.

D) Data measured to compare handwriting between the left and right hands of 30 subjects.

Feedback: Handwriting between left and right hands is paired data since it is repeated measurements on the same subject.

Points Earned: 0.0/1.0

Correct Answer(s): D

A) the group of people from which the sample is taken

B) all of the people in the United States

C) all of the people in the world

D) the people who comprise the sample

Feedback: The population is the larger group of people from which the sample was taken

Points Earned: 0.0/1.0

Correct Answer(s): A

2.

The sample mean is an estimate of:

A) The average value for people NOT in the population

B) The average value in the sample

C) The true population mean

Feedback: The sample mean is an estimate of the true population mean. It is, however, an exact measurement of the average value in the sample since the sample data is what is used to calculate the sample mean.

Points Earned: 0.0/1.0

Correct Answer(s): C

3.

A summary measure calculated from the sample is called a(n):

A) parameter

B) statistic

C) outlier

Feedback: Sample measures are statistics; population measures are parameters

Points Earned: 1.0/1.0

Correct Answer(s): B

4.

Which of the following is a parameter?

A) mu

B) x-bar

C) p-hat

D) Z

Feedback: x-bar and p-hat are sample statistics while Z is a test statistic.

Points Earned: 0.0/1.0

Correct Answer(s): A

5.

Which of the following is an example of paired data?

A) The average time to cook the same meal is compared for men and women.

B) The proportion of children that get a cold in Winter in Pittsburgh is compared to the proportion of children that get a colding in Winter in Dallas.

C) A researcher wants to test the time it takes to send a text message for adults and children.

D) Data measured to compare handwriting between the left and right hands of 30 subjects.

Feedback: Handwriting between left and right hands is paired data since it is repeated measurements on the same subject.

Points Earned: 0.0/1.0

Correct Answer(s): D

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