Question 1

In the statement z = 3.14, p < .05, which of the following interpretations is true?

Accepted Answer

A) There is a significant difference between the sample value and the population. 
B) There is a marginally significant difference between the sample value and the population. 
C) There is not a significant difference between the sample value and the population. 
D) The answer cannot be determined from the information given. 
A) There is a significant difference between the sample value and the population. 
B) There is a marginally significant difference between the sample value and the population. 
C) There is not a significant difference between the sample value and the population. 
D) The answer cannot be determined from the information given.

Question 2

In the effect size formula, what does X bar stand for?

Accepted Answer

A) the sample mean 
B) effect size 
C) the population mean 
D) the population standard deviation 
A) the sample mean 
B) effect size 
C) the population mean 
D) the population standard deviation

Question 3

The standard error of the mean is calculated as ______.

Accepted Answer

A) the population standard deviation divided by the square root of the size of the sample 
B) the population standard deviation divided by the size of the sample 
C) the square root of the size of the sample divided by the population standard deviation 
D) the sample standard deviation divided by the size of the sample 
A) the population standard deviation divided by the square root of the size of the sample 
B) the population standard deviation divided by the size of the sample 
C) the square root of the size of the sample divided by the population standard deviation 
D) the sample standard deviation divided by the size of the sample

Question 4

In t-test, if the resultant t value is -2.72 and p<.05, what is the interpretation?

Accepted Answer

A) There is a statistical significance in the test. 
B) There is no statistical significance in the test. 
C) unknown 
D) not sure 
A) There is a statistical significance in the test. 
B) There is no statistical significance in the test. 
C) unknown 
D) not sure

Question 5

If you have a sample size of 4 and a population standard deviation of 12, what is your standard error of the mean?

Accepted Answer

A) −3 
B) 11 
C) 6 
D) 5 
A) −3 
B) 11 
C) 6 
D) 5

Question 6

What is an example in which a one-sample Z test would be appropriate?

Accepted Answer

Any test in which th

Question 7

Write the formula of a directional or nondirectional research hypothesis for the following research problem: The Geography Department is interested in finding out if the average GPA of this year's graduating seniors is comparable to the average GPA of graduating seniors over the last 40 years.

Accepted Answer

The answer of Write the formula of a directional or...

Question 8

If your population average is 45, your sample mean is 50, and your standard error of the mean is 5, what is your observed z value?

Accepted Answer

A) 0 
B) −.1 
C) 1 
D) −1 
A) 0 
B) −.1 
C) 1 
D) −1

Question 9

According to your text, there are five steps that you should follow in order to compute and interpret a Z-test statistic manually.

Accepted Answer

A) True 
 B)False

Question 10

A large effect size is any value above .5.

Accepted Answer

A) True 
 B)False

Question 11

Mr.Moo would like to find out if his daisies grow at a faster average rate than the average rate of daisy growth in his neighborhood.State this as a research hypothesis.

Accepted Answer

The average rate of growth for

Question 12

If your sample mean is 100, your population average is 90, and your standard error of the mean is 10, what is your observed z value?

Accepted Answer

A) 0 
B) −.1 
C) 1 
D) −1 
A) 0 
B) −.1 
C) 1 
D) −1

Question 13

If your sample mean is 30, your population average is 10, and your standard error of the mean is 5, what is your observed z value?

Accepted Answer

A) 6 
B) −2.5 
C) 4 
D) 20 
A) 6 
B) −2.5 
C) 4 
D) 20

Question 14

If you have a population standard deviation of 18 and a sample size of 81, what is your standard error of the mean?

Accepted Answer

A) −3 
B) 2 
C) 1 
D) 9 
A) −3 
B) 2 
C) 1 
D) 9

Question 15

If you have a population standard deviation of 9 and a sample size of 144, what is your standard error of the mean?

Accepted Answer

A) 7.5 
B) 0.75 
C) 12 
D) 8 
A) 7.5 
B) 0.75 
C) 12 
D) 8

Question 16

In interpreting effect size, what is the meaning of effect size at 0.2?

Accepted Answer

A) small effect size 
B) medium effect size 
C) large effect size 
D) weak effect size 
A) small effect size 
B) medium effect size 
C) large effect size 
D) weak effect size

Question 17

Write out, in words, a research hypothesis for this statement: The Geography Department is interested in finding out if the average GPA of this year's graduating seniors is comparable to the average GPA of graduating seniors over the last 40 years.

Accepted Answer

The average GPA of the Geograp

Question 18

The level of risk-or level of significance-is determined by the _______.

Accepted Answer

A) participants 
B) researchers 
C) study sponsors 
D) results 
A) participants 
B) researchers 
C) study sponsors 
D) results

Question 19

If you have a population standard deviation of 20 and a sample size of 4, what is your standard error of the mean?

Accepted Answer

A) −10 
B) 10 
C) 5 
D) −5 
A) −10 
B) 10 
C) 5 
D) −5

Exam 10: Only the Lonely: The One Sample Z-Test

In the statement z = 3.14, p < .05, which of the following interpretations is true?

In the effect size formula, what does X bar stand for?

The standard error of the mean is calculated as ______.

In t-test, if the resultant t value is -2.72 and p<.05, what is the interpretation?

If you have a sample size of 4 and a population standard deviation of 12, what is your standard error of the mean?

What is an example in which a one-sample Z test would be appropriate?

Write the formula of a directional or nondirectional research hypothesis for the following research problem: The Geography Department is interested in finding out if the average GPA of this year's graduating seniors is comparable to the average GPA of graduating seniors over the last 40 years.

If your population average is 45, your sample mean is 50, and your standard error of the mean is 5, what is your observed z value?

According to your text, there are five steps that you should follow in order to compute and interpret a Z-test statistic manually.

A large effect size is any value above .5.

Mr.Moo would like to find out if his daisies grow at a faster average rate than the average rate of daisy growth in his neighborhood.State this as a research hypothesis.

If your sample mean is 100, your population average is 90, and your standard error of the mean is 10, what is your observed z value?

If your sample mean is 30, your population average is 10, and your standard error of the mean is 5, what is your observed z value?

If you have a population standard deviation of 18 and a sample size of 81, what is your standard error of the mean?

If you have a population standard deviation of 9 and a sample size of 144, what is your standard error of the mean?

In interpreting effect size, what is the meaning of effect size at 0.2?

Write out, in words, a research hypothesis for this statement: The Geography Department is interested in finding out if the average GPA of this year's graduating seniors is comparable to the average GPA of graduating seniors over the last 40 years.

The level of risk-or level of significance-is determined by the _______.

If you have a population standard deviation of 20 and a sample size of 4, what is your standard error of the mean?

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