Question 1

Which of the following are aspects of a study that can increase power?​

Accepted Answer

A) greater differences produced by the independent variable 
B) smaller variability of raw scores in each condition 
C) increased sample size 
D) all of the options are correct 
A) greater differences produced by the independent variable 
B) smaller variability of raw scores in each condition 
C) increased sample size 
D) all of the options are correct

Question 2

Briefly explain the confounds of testing and regression to the mean.​

Accepted Answer

​Testing is a threat to internal validit

Question 3

Briefly explain the confounds of instrumentation and mortality.​

Accepted Answer

​Instrumentation is a threat to internal

Question 4

Imagine that you conducted an independent-groups t test with 12 participants in each group. For a two-tailed test, the tcv at a = .05 would be​

Accepted Answer

A) ±1.717. 
B) ±2.074. 
C) ±1.711. 
D) ±2.064. 
A) ±1.717. 
B) ±2.074. 
C) ±1.711. 
D) ±2.064.

Question 5

Briefly explain the relationship between participant effects, experimenter effects, single-blind experiments, and double-blind experiments.​

Accepted Answer

A participant effect is a threat to inte

Question 6

For an independent-groups t test, the value of Cohen's d describes​

Accepted Answer

A) the size of the treatment effect. 
B) the chance of a Type I error. 
C) the chance of a Type II error. 
D) the overall chance level in the experiment. 
A) the size of the treatment effect. 
B) the chance of a Type I error. 
C) the chance of a Type II error. 
D) the overall chance level in the experiment.

Question 7

As sample variance _____, the value of the t test _____.​

Accepted Answer

A) increases; increases 
B) decreases; decreases 
C) increases; decreases 
D) increases; stays the same 
A) increases; increases 
B) decreases; decreases 
C) increases; decreases 
D) increases; stays the same

Question 8

When using an independent-groups t test, the difference between the means is divided by the standard error of the

Accepted Answer

A) mean. 
B) standard deviation. 
C) difference between means 
D) difference between standard deviations. 
A) mean. 
B) standard deviation. 
C) difference between means 
D) difference between standard deviations.

Question 9

In an experimental study of the effects of exercise on stress, subjects are randomly assigned to either the no exercise or the exercise conditions. Identify what type of study this is-between-, within-, or matched-subjects. In addition, identify the independent and dependent variables and the control and experimental groups.​

Accepted Answer

​This is a between-subjects design. The

Question 10

What is a confound and how is it related to internal validity?​

Accepted Answer

​A confound is an uncontrolled extraneou

Question 11

If, after calculating an independent-groups t test you find that it is equal to zero, then​

Accepted Answer

A) the two sample means differ significantly. 
B) the two sample means do not differ significantly. 
C) you have done something wrong. 
D) the two population means differ significantly. 
A) the two sample means differ significantly. 
B) the two sample means do not differ significantly. 
C) you have done something wrong. 
D) the two population means differ significantly.

Question 12

In an experimental study of the effects of exercise on stress, stress is the

Accepted Answer

A) dependent variable. 
B) independent variable. 
C) control group. 
D) experimental group. 
A) dependent variable. 
B) independent variable. 
C) control group. 
D) experimental group.

Question 13

If the null hypothesis is true, then the t test should be close to​

Accepted Answer

A) 0.00. 
B) ±1.65. 
C) ±1.96. 
D) ±3.00. 
A) 0.00. 
B) ±1.65. 
C) ±1.96. 
D) ±3.00.

Question 14

If a researcher reported for an independent-groups t test that t(18) = 2.90, p​

Accepted Answer

A) 18 
B) 20 
C) 10 
D) 9 
A) 18 
B) 20 
C) 10 
D) 9

Question 15

A decline in performance due to repeated testing is a(n) _____ effect and improvement in performance due to repeated testing is a(n) _____ effect.​

Accepted Answer

A) instrumentation; mortality 
B) mortality; instrumentation 
C) practice; fatigue 
D) fatigue; practice 
A) instrumentation; mortality 
B) mortality; instrumentation 
C) practice; fatigue 
D) fatigue; practice

Question 16

What are the advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design?​

Accepted Answer

With a posttest-only control group desig

Question 17

A limitation in the ability to differentiate between scores at the bottom of the scale is a _____ and a limitation in the ability to differentiate between scores at the top of the scale is a _____.

Accepted Answer

A) practice effect; fatigue effect 
B) fatigue effect; practice effect 
C) ceiling effect; floor effect 
D) floor effect; ceiling effect 
A) practice effect; fatigue effect 
B) fatigue effect; practice effect 
C) ceiling effect; floor effect 
D) floor effect; ceiling effect

Question 18

John conducted an experiment to test the effectiveness of a smoking cessation program. The experiment took place over a 1-month time period. Participants in the control group and the experimental group (those who participated in the smoking cessation program) recorded the number of cigarettes that they smoked each day. John was unaware that "national stop-smoking week" also happened to take place during the 1-month time period of his experiment. John's experiment is now confounded by​

Accepted Answer

A) maturation.​ 
B) history. 
C) regression to the mean. 
D) mortality. 
A) maturation.​ 
B) history. 
C) regression to the mean. 
D) mortality.

Question 19

What is the relationship between external validity and the college sophomore problem?​

Accepted Answer

External validity is the extent to which

Question 20

An independent-groups t test​

Accepted Answer

A) compares sample means for two related groups. 
B) compares sample means for two unrelated groups. 
C) compares standard deviations for two unrelated group. 
D) compares sample means for three or more unrelated groups. 
A) compares sample means for two related groups. 
B) compares sample means for two unrelated groups. 
C) compares standard deviations for two unrelated group. 
D) compares sample means for three or more unrelated groups.

Which of the following are aspects of a study that can increase power?

Briefly explain the confounds of testing and regression to the mean.

Briefly explain the confounds of instrumentation and mortality.

Imagine that you conducted an independent-groups t test with 12 participants in each group. For a two-tailed test, the t_cv at a = .05 would be

Briefly explain the relationship between participant effects, experimenter effects, single-blind experiments, and double-blind experiments.

For an independent-groups t test, the value of Cohen's d describes

As sample variance _, the value of the t test _.

When using an independent-groups t test, the difference between the means is divided by the standard error of the

What is a confound and how is it related to internal validity?

If, after calculating an independent-groups t test you find that it is equal to zero, then

In an experimental study of the effects of exercise on stress, stress is the

If the null hypothesis is true, then the t test should be close to

If a researcher reported for an independent-groups t test that t(18) = 2.90, p

A decline in performance due to repeated testing is a(n) _ effect and improvement in performance due to repeated testing is a(n) _ effect.

What are the advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design?

A limitation in the ability to differentiate between scores at the bottom of the scale is a _ and a limitation in the ability to differentiate between scores at the top of the scale is a _.

What is the relationship between external validity and the college sophomore problem?

An independent-groups t test

Thinking Like a Scientist

Getting Started

Defining Measuring and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

Introduction to Inferential Statistics

Experimental Design and Analysis II

Experimental Design and Analysis III

Experimental Design and Analysis Iv

Quasi Experimental and Single Case Designs

Nonparametric Inferential Statistics

APA Communication Guidelines

Filters

Exam 9: Experimental Design and Analysis I

Which of the following are aspects of a study that can increase power?​

Briefly explain the confounds of testing and regression to the mean.​

Briefly explain the confounds of instrumentation and mortality.​

Imagine that you conducted an independent-groups t test with 12 participants in each group. For a two-tailed test, the tcv at a = .05 would be​

Briefly explain the relationship between participant effects, experimenter effects, single-blind experiments, and double-blind experiments.​

For an independent-groups t test, the value of Cohen's d describes​

As sample variance _____, the value of the t test _____.​

When using an independent-groups t test, the difference between the means is divided by the standard error of the

What is a confound and how is it related to internal validity?​

If, after calculating an independent-groups t test you find that it is equal to zero, then​

In an experimental study of the effects of exercise on stress, stress is the

If the null hypothesis is true, then the t test should be close to​

If a researcher reported for an independent-groups t test that t(18) = 2.90, p​

A decline in performance due to repeated testing is a(n) _____ effect and improvement in performance due to repeated testing is a(n) _____ effect.​

What are the advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design?​

A limitation in the ability to differentiate between scores at the bottom of the scale is a _____ and a limitation in the ability to differentiate between scores at the top of the scale is a _____.

What is the relationship between external validity and the college sophomore problem?​

An independent-groups t test​

Thinking Like a Scientist

Getting Started

Defining Measuring and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

Introduction to Inferential Statistics

Experimental Design and Analysis II

Experimental Design and Analysis III

Experimental Design and Analysis Iv

Quasi Experimental and Single Case Designs

Nonparametric Inferential Statistics

APA Communication Guidelines

Filters

Which of the following are aspects of a study that can increase power?

Briefly explain the confounds of testing and regression to the mean.

Briefly explain the confounds of instrumentation and mortality.

Imagine that you conducted an independent-groups t test with 12 participants in each group. For a two-tailed test, the t_cv at a = .05 would be

Briefly explain the relationship between participant effects, experimenter effects, single-blind experiments, and double-blind experiments.

For an independent-groups t test, the value of Cohen's d describes

As sample variance _, the value of the t test _.

What is a confound and how is it related to internal validity?

If, after calculating an independent-groups t test you find that it is equal to zero, then

If the null hypothesis is true, then the t test should be close to

If a researcher reported for an independent-groups t test that t(18) = 2.90, p

A decline in performance due to repeated testing is a(n) _ effect and improvement in performance due to repeated testing is a(n) _ effect.

What are the advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design?

A limitation in the ability to differentiate between scores at the bottom of the scale is a _ and a limitation in the ability to differentiate between scores at the top of the scale is a _.

What is the relationship between external validity and the college sophomore problem?

An independent-groups t test