Question 1

b = 1 ?2- a .

Accepted Answer

A) True 
 B)False

Question 2

In an experiment where the experimental effect is such that P real = 0.70 and N = 14, what is the power of the experiment? Use a = 0.052 tail with the sign test.

Accepted Answer

In the context of the question, it seems

Question 3

The greater the sample size the greater the power.

Accepted Answer

A) True 
 B)False

Question 4

The concept of statistical power applies only to the sign test.

Accepted Answer

A) True 
 B)False

Question 5

A real effect of the independent variable is defined as _________.

Accepted Answer

A)  all possible effects including no change in the dependent variable 
B)  any effect that produces a change in the dependent variable 
C)  an effect that produces an increase in the value of the dependent variable 
D)  an effect showing no change in the dependent variable 
A)  all possible effects including no change in the dependent variable 
B)  any effect that produces a change in the dependent variable 
C)  an effect that produces an increase in the value of the dependent variable 
D)  an effect showing no change in the dependent variable

Question 6

With other factors held constant, as the effect of the independent variable decreases, power will _________ and the probability of a Type II error will _________.

Accepted Answer

A)  decrease, increase 
B)  decrease, decrease 
C)  increase, decrease 
D)  increase, increase 
A)  decrease, increase 
B)  decrease, decrease 
C)  increase, decrease 
D)  increase, increase

Question 7

In an experiment, if the analysis of the data does not allow us to reject the null hypothesis, this can only be so because we do not have enough experimental power to reject H 0 .  Why?

Accepted Answer

A) True 
 B)False

Question 8

When is it important to know the power of an experiment? Why?

Accepted Answer

It is important to know the power of an

Question 9

One can increase power by _________.

Accepted Answer

A)  increasing N 
B)  making alpha more stringent 
C)  increasing the effect of independent variable 
D)  increasing N and the effect of independent variable 
A)  increasing N 
B)  making alpha more stringent 
C)  increasing the effect of independent variable 
D)  increasing N and the effect of independent variable

Question 10

A wine company has retained you as a consultant to help evaluate the taste preference for their wine compared to the market leader. You plan to give 20 subjects a taste of both wines and ask them to rate the wines on a 10 point scale. The order of presentation is randomized so there is no order effect. Your plan is to analyze the results using the sign test. If the size of the difference is such that P real = 0.80, what is the power of your experiment to detect a preference for one wine or the other? Use a = 0.052 tail.

Accepted Answer

To calculate the power of the experiment

Question 11

Using sample data, it is impossible to prove with certainty that H 0 is true.

Accepted Answer

A) True 
 B)False

Question 12

If beta = 0.7500, what is the power of the experiment?

Accepted Answer

A)  0.7500 
B)  0.5000 
C)  0.2500 
D)  1.0000 
A)  0.7500 
B)  0.5000 
C)  0.2500 
D)  1.0000

Question 13

In an experiment with N = 14 and P real = 0.10, what is the power using a = .012 tail?

Accepted Answer

A)  0.0500 
B)  1.0000 
C)  0.5847 
D)  0.9868 
A)  0.0500 
B)  1.0000 
C)  0.5847 
D)  0.9868

Question 14

Decreasing beta will generally cause a to increase.

Accepted Answer

A) True 
 B)False

Question 15

Maximizing the power of an experiment _________.

Accepted Answer

A)  minimizes alpha 
B)  minimizes beta 
C)  increases the probability of rejecting H 0 when H 0 is true 
D)  increases the probability of making a Type II error 
A)  minimizes alpha 
B)  minimizes beta 
C)  increases the probability of rejecting H 0 when H 0 is true 
D)  increases the probability of making a Type II error

Question 16

You are considering testing a new drug that is supposed to facilitate learning in mentally retarded children. Because there is relatively little known about the drug, you plan to use a nondirectional alternative hypothesis. Since your resources are limited, you can test only 20 subjects. The subjects will be run in a repeated measures design and the data will be analyzed with the sign test, using a = 0.052 tail. What is the power this time?

Accepted Answer

A)  0.4163 
B)  0.2969 
C)  0.6161 
D)  0.2458 
A)  0.4163 
B)  0.2969 
C)  0.6161 
D)  0.2458

Question 17

In an experiment, if the effect of the independent variable and alpha remain the same and N increases, _________.

Accepted Answer

A)  power increases 
B)  power decreases 
C)  power remains the same 
D)  cannot be determined 
A)  power increases 
B)  power decreases 
C)  power remains the same 
D)  cannot be determined

Question 18

List three variables (not including beta) that affect power and state how increases in the variables affect power.

Accepted Answer

In the context of statistical hypothesis

Question 19

P real is defined as _________.

Accepted Answer

A)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has a real effect 
B)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has no effect 
C)  the probability of getting a plus with any subject in the sample of the experiment when chance alone is at work 
D)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has a real effect in the direction predicted by the directional H 1 
A)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has a real effect 
B)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has no effect 
C)  the probability of getting a plus with any subject in the sample of the experiment when chance alone is at work 
D)  the probability of getting a plus with any subject in the sample of the experiment when the independent variable has a real effect in the direction predicted by the directional H 1

Question 20

In an experiment the value for beta has been shown to be .7503. What is the power of this experiment?

Accepted Answer

In the context of hypothesis testing in

b = 1 ?2- a .

In an experiment where the experimental effect is such that P _real = 0.70 and N = 14, what is the power of the experiment? Use a = 0.05_{2 tail}with the sign test.

The greater the sample size the greater the power.

The concept of statistical power applies only to the sign test.

A real effect of the independent variable is defined as _________.

With other factors held constant, as the effect of the independent variable decreases, power will _ and the probability of a Type II error will _.

In an experiment, if the analysis of the data does not allow us to reject the null hypothesis, this can only be so because we do not have enough experimental power to reject H ₀ . Why?

When is it important to know the power of an experiment? Why?

One can increase power by _________.

Using sample data, it is impossible to prove with certainty that H ₀ is true.

If beta = 0.7500, what is the power of the experiment?

In an experiment with N = 14 and P _real = 0.10, what is the power using a = .01_{2 tail}?

Decreasing beta will generally cause a to increase.

Maximizing the power of an experiment _________.

In an experiment, if the effect of the independent variable and alpha remain the same and N increases, _________.

List three variables (not including beta) that affect power and state how increases in the variables affect power.

P _real is defined as _________.

In an experiment the value for beta has been shown to be .7503. What is the power of this experiment?

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

Exam 11: Power

b = 1 ?2- a .

In an experiment where the experimental effect is such that P real = 0.70 and N = 14, what is the power of the experiment? Use a = 0.052 tail with the sign test.

The greater the sample size the greater the power.

The concept of statistical power applies only to the sign test.

A real effect of the independent variable is defined as _________.

With other factors held constant, as the effect of the independent variable decreases, power will _________ and the probability of a Type II error will _________.

In an experiment, if the analysis of the data does not allow us to reject the null hypothesis, this can only be so because we do not have enough experimental power to reject H 0 . Why?

When is it important to know the power of an experiment? Why?

One can increase power by _________.

Using sample data, it is impossible to prove with certainty that H 0 is true.

If beta = 0.7500, what is the power of the experiment?

In an experiment with N = 14 and P real = 0.10, what is the power using a = .012 tail?

Decreasing beta will generally cause a to increase.

Maximizing the power of an experiment _________.

In an experiment, if the effect of the independent variable and alpha remain the same and N increases, _________.

List three variables (not including beta) that affect power and state how increases in the variables affect power.

P real is defined as _________.

In an experiment the value for beta has been shown to be .7503. What is the power of this experiment?

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

In an experiment where the experimental effect is such that P _real = 0.70 and N = 14, what is the power of the experiment? Use a = 0.05_{2 tail}with the sign test.

With other factors held constant, as the effect of the independent variable decreases, power will _ and the probability of a Type II error will _.

In an experiment, if the analysis of the data does not allow us to reject the null hypothesis, this can only be so because we do not have enough experimental power to reject H ₀ . Why?

Using sample data, it is impossible to prove with certainty that H ₀ is true.

In an experiment with N = 14 and P _real = 0.10, what is the power using a = .01_{2 tail}?

P _real is defined as _________.