Question 1

Which of the following is an accurate definition for the power of a statistical test?​

Accepted Answer

A) ​The probability of rejecting a true null hypothesis 
B) ​The probability of supporting true null hypothesis 
C) ​The probability of rejecting a false null hypothesis 
D) ​The probability of supporting a false null hypothesis 
A) ​The probability of rejecting a true null hypothesis 
B) ​The probability of supporting true null hypothesis 
C) ​The probability of rejecting a false null hypothesis 
D) ​The probability of supporting a false null hypothesis

Question 2

If a research report includes the term significant result,it means that the null hypothesis was rejected.

Accepted Answer

A) True 
 B)False

Question 3

A researcher selects a sample of n = 25 from a normal population with µ = 40 and σ = 10.If the treatment is expected to increase scores by 3 points,what is the power of a two-tailed hypothesis test using α = .05?

Accepted Answer

The critical region boundary of z = +1.9

Question 4

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).​

Accepted Answer

A) True 
 B)False

Question 5

What is measured by the numerator of the z-score test statistic?​

Accepted Answer

A) ​The average distance between M and µ that would be expected if H0 was true 
B) ​The actual distance between M and µ 
C) ​The position of the sample mean relative to the critical region 
D) ​Whether or not there is a significant difference between M and µ 
A) ​The average distance between M and µ that would be expected if H0 was true 
B) ​The actual distance between M and µ 
C) ​The position of the sample mean relative to the critical region 
D) ​Whether or not there is a significant difference between M and µ

Question 6

If a hypothesis test leads to rejecting the null hypothesis,it means that the data did not provide enough evidence to conclude that the treatment has an effect.

Accepted Answer

A) True 
 B)False

Question 7

By selecting a larger alpha level,a researcher is ____.​

Accepted Answer

A) ​attempting to make it more difficult to reject H0 
B) ​less able to detect a treatment effect 
C) ​increasing the risk of a Type I error 
D) ​decreasing the risk of a Type I error 
A) ​attempting to make it more difficult to reject H0 
B) ​less able to detect a treatment effect 
C) ​increasing the risk of a Type I error 
D) ​decreasing the risk of a Type I error

Question 8

A sample of n = 16 individuals is selected from a population with μ = 60 and σ = 6 and a treatment is administered to the sample.After treatment,the sample mean is M = 63.What is the value of Cohen's d for this sample?​

Accepted Answer

A) ​0.33 
B) ​0.50 
C) ​2.00 
D) ​3.00 
A) ​0.33 
B) ​0.50 
C) ​2.00 
D) ​3.00

Question 9

A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of µ = 80 and a standard deviation of σ = 12.After treatment,the effect size is measured by computing Cohen's d,and a value of d = 0.50 is obtained.Based on this information,what is the mean for the treated sample?​

Accepted Answer

A) ​M = 6 
B) ​M = 82 
C) ​M = 86 
D) ​This cannot be answered without knowing the sample size. 
A) ​M = 6 
B) ​M = 82 
C) ​M = 86 
D) ​This cannot be answered without knowing the sample size.

Question 10

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If a hypothesis test is used to evaluate the effect of the treatment,which combination of factors is most likely to result in rejecting the null hypothesis?​

Accepted Answer

A) ​A sample mean near 80 with α = .05 
B) ​A sample mean near 80 with α = .01 
C) ​A sample mean much different than 80 with α = .05 
D) ​A sample mean much different than 80 with α = .01 
A) ​A sample mean near 80 with α = .05 
B) ​A sample mean near 80 with α = .01 
C) ​A sample mean much different than 80 with α = .05 
D) ​A sample mean much different than 80 with α = .01

Question 11

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?​

Accepted Answer

A) ​Reject the null hypothesis with α = .05 but not with α = .01. 
B) ​Reject the null hypothesis with either α = .05 or α = .01. 
C) ​Fail to reject the null hypothesis with either α = .05 or α = .01. 
D) ​This cannot be answered without additional information. 
A) ​Reject the null hypothesis with α = .05 but not with α = .01. 
B) ​Reject the null hypothesis with either α = .05 or α = .01. 
C) ​Fail to reject the null hypothesis with either α = .05 or α = .01. 
D) ​This cannot be answered without additional information.

Question 12

The critical region for a hypothesis test consists of sample outcomes that are very unlikely to occur if the null hypothesis is true.

Accepted Answer

A) True 
 B)False

Question 13

Most researchers would like the hypothesis test to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is directly addressed by the null hypothesis?​

Accepted Answer

A) ​The population before treatment 
B) ​The population after treatment 
C) ​The sample before treatment 
D) ​The sample after treatment 
A) ​The population before treatment 
B) ​The population after treatment 
C) ​The sample before treatment 
D) ​The sample after treatment

Question 15

The power of a hypothesis test is the probability that the sample mean will be in the critical region if the treatment has an effect.

Accepted Answer

A) True 
 B)False

Question 16

Under what circumstances can a very small treatment effect still be significant?​

Accepted Answer

A) If the sample size (n) is very large​ 
B) ​If the sample standard deviation (σ) is very large 
C) ​If the standard error of M (σ M) is very large 
D) ​All of the other three factors will result in a significant treatment effect. 
A) If the sample size (n) is very large​ 
B) ​If the sample standard deviation (σ) is very large 
C) ​If the standard error of M (σ M) is very large 
D) ​All of the other three factors will result in a significant treatment effect.

Which of the following is an accurate definition for the power of a statistical test?

If a research report includes the term significant result,it means that the null hypothesis was rejected.

A researcher selects a sample of n = 25 from a normal population with µ = 40 and σ = 10.If the treatment is expected to increase scores by 3 points,what is the power of a two-tailed hypothesis test using α = .05?

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).

What is measured by the numerator of the z-score test statistic?

If a hypothesis test leads to rejecting the null hypothesis,it means that the data did not provide enough evidence to conclude that the treatment has an effect.

By selecting a larger alpha level,a researcher is ____.

A sample of n = 16 individuals is selected from a population with μ = 60 and σ = 6 and a treatment is administered to the sample.After treatment,the sample mean is M = 63.What is the value of Cohen's d for this sample?

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If a hypothesis test is used to evaluate the effect of the treatment,which combination of factors is most likely to result in rejecting the null hypothesis?

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?

The critical region for a hypothesis test consists of sample outcomes that are very unlikely to occur if the null hypothesis is true.

Most researchers would like the hypothesis test to reject the null hypothesis.

Which of the following is directly addressed by the null hypothesis?

The power of a hypothesis test is the probability that the sample mean will be in the critical region if the treatment has an effect.

Under what circumstances can a very small treatment effect still be significant?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

Exam 8: Introduction to Hypothesis Testing

Which of the following is an accurate definition for the power of a statistical test?​

If a research report includes the term significant result,it means that the null hypothesis was rejected.

A researcher selects a sample of n = 25 from a normal population with µ = 40 and σ = 10.If the treatment is expected to increase scores by 3 points,what is the power of a two-tailed hypothesis test using α = .05?

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).​

What is measured by the numerator of the z-score test statistic?​

If a hypothesis test leads to rejecting the null hypothesis,it means that the data did not provide enough evidence to conclude that the treatment has an effect.

By selecting a larger alpha level,a researcher is ____.​

A sample of n = 16 individuals is selected from a population with μ = 60 and σ = 6 and a treatment is administered to the sample.After treatment,the sample mean is M = 63.What is the value of Cohen's d for this sample?​

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If a hypothesis test is used to evaluate the effect of the treatment,which combination of factors is most likely to result in rejecting the null hypothesis?​

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?​

The critical region for a hypothesis test consists of sample outcomes that are very unlikely to occur if the null hypothesis is true.

Most researchers would like the hypothesis test to reject the null hypothesis.

Which of the following is directly addressed by the null hypothesis?​

The power of a hypothesis test is the probability that the sample mean will be in the critical region if the treatment has an effect.

Under what circumstances can a very small treatment effect still be significant?​

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

Which of the following is an accurate definition for the power of a statistical test?

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).

What is measured by the numerator of the z-score test statistic?

By selecting a larger alpha level,a researcher is ____.

A sample of n = 16 individuals is selected from a population with μ = 60 and σ = 6 and a treatment is administered to the sample.After treatment,the sample mean is M = 63.What is the value of Cohen's d for this sample?

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If a hypothesis test is used to evaluate the effect of the treatment,which combination of factors is most likely to result in rejecting the null hypothesis?

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?

Which of the following is directly addressed by the null hypothesis?

Under what circumstances can a very small treatment effect still be significant?