Question 1

One can optimize and strengthen the power of a t test in all of the following ways, EXCEPT

Accepted Answer

A)  by using stronger treatments to drive the means of the two groups farther apart. 
B)  by decreasing the effect size of the study. 
C)  by decreasing the variability within groups. 
D)  by increasing the total size of the study. 
A)  by using stronger treatments to drive the means of the two groups farther apart. 
B)  by decreasing the effect size of the study. 
C)  by decreasing the variability within groups. 
D)  by increasing the total size of the study.

Question 2

In a signal-to-noise ratio, the "signal" represents the

Accepted Answer

A)  number of participants in both groups. 
B)  number of participants minus some value. 
C)  variability in scores within the groups. 
D)  difference between the means of both groups. 
A)  number of participants in both groups. 
B)  number of participants minus some value. 
C)  variability in scores within the groups. 
D)  difference between the means of both groups.

Question 3

William has 20 students take a test on two different occasions. What would be the df if he wanted to compare the mean scores from both occasions?

Accepted Answer

A)  39 
B)  38 
C)  19 
D)  18 
A)  39 
B)  38 
C)  19 
D)  18

Question 4

What is the difference between independent and nonindependent samples? Which t test would one use under each circumstance?

Accepted Answer

Independent samples refer to two groups

Question 5

When the results in one group are not influenced by the results in the other group, the samples are considered to be

Accepted Answer

A)  random. 
B)  independent. 
C)  dependent. 
D)  separate. 
A)  random. 
B)  independent. 
C)  dependent. 
D)  separate.

Question 6

Paul wants to know if students in his class spend more time watching basketball or football on television. Paul has 13 women and 12 men record the numbers of hours they spent watching football and basketball during a seven-day period. What would be the df associated with the t test in this situation?

Accepted Answer

A)  13 
B)  23 
C)  24 
D)  25 
A)  13 
B)  23 
C)  24 
D)  25

Question 7

Why is it as important to calculate the effect size in addition to evaluating the statistical significance of an obtained t value?

Accepted Answer

Calculating the effect size in addition

Question 8

The t test is used to compare the means from how many groups?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  5 
A)  2 
B)  3 
C)  4 
D)  5

Question 9

A waitress is interested in whether she receives larger tips in general from her male customers than her female customers. She records the gender of the customer who paid the bill and the amount of the tip over a two-day period. Statistically speaking, the "noise" in this research scenario would be

Accepted Answer

A)  the difference between the average tip amounts received on the first and second days. 
B)  the fluctuation in tip amounts received from male customers during the two-day period. 
C)  the difference between the average tip amounts received from the male and female customers. 
D)  the fluctuation in tip amounts received from the male and female customers. 
A)  the difference between the average tip amounts received on the first and second days. 
B)  the fluctuation in tip amounts received from male customers during the two-day period. 
C)  the difference between the average tip amounts received from the male and female customers. 
D)  the fluctuation in tip amounts received from the male and female customers.

Question 10

Which of the following statistical tests would one use to compare the means from two groups?

Accepted Answer

A)  Pearson r 
B)  t test 
C)  chi-square 
D)  z score test 
A)  Pearson r 
B)  t test 
C)  chi-square 
D)  z score test

Question 11

The effect size computed for the t test is equivalent to ____________.

Accepted Answer

A)  the Pearson r 
B)  the phi coefficient 
C)  the Spearman rho 
D)  the point-biserial correlation 
A)  the Pearson r 
B)  the phi coefficient 
C)  the Spearman rho 
D)  the point-biserial correlation

One can optimize and strengthen the power of a t test in all of the following ways, EXCEPT

In a signal-to-noise ratio, the "signal" represents the

William has 20 students take a test on two different occasions. What would be the df if he wanted to compare the mean scores from both occasions?

What is the difference between independent and nonindependent samples? Which t test would one use under each circumstance?

When the results in one group are not influenced by the results in the other group, the samples are considered to be

Why is it as important to calculate the effect size in addition to evaluating the statistical significance of an obtained t value?

The t test is used to compare the means from how many groups?

A waitress is interested in whether she receives larger tips in general from her male customers than her female customers. She records the gender of the customer who paid the bill and the amount of the tip over a two-day period. Statistically speaking, the "noise" in this research scenario would be

Which of the following statistical tests would one use to compare the means from two groups?

The effect size computed for the t test is equivalent to ____________.

Behavioral Research and the Scientific Method

From Hunches to Testable Hypotheses

Ethical Considerations and Guidelines

Carpenter, S 1998 Content Analysis Project for Research Novices Teaching of Psychology

Methods for Looking Within Ourselves

Reliability and Validity in Measurement and Research

Randomized Experiments and Causal Inference

Nonrandomized Research and Causal Reasoning

Survey Research and Subject Recruitment

Summarizing the Data

Correlating Variables

Understanding P Values and Effect Size Indicators

Comparisons of More Than Two Conditions

The Analysis of Frequency Tables

Filters

Exam 13: The Comparison of Two Conditions

One can optimize and strengthen the power of a t test in all of the following ways, EXCEPT

In a signal-to-noise ratio, the "signal" represents the

William has 20 students take a test on two different occasions. What would be the df if he wanted to compare the mean scores from both occasions?

What is the difference between independent and nonindependent samples? Which t test would one use under each circumstance?

When the results in one group are not influenced by the results in the other group, the samples are considered to be

Why is it as important to calculate the effect size in addition to evaluating the statistical significance of an obtained t value?

The t test is used to compare the means from how many groups?

A waitress is interested in whether she receives larger tips in general from her male customers than her female customers. She records the gender of the customer who paid the bill and the amount of the tip over a two-day period. Statistically speaking, the "noise" in this research scenario would be

Which of the following statistical tests would one use to compare the means from two groups?

The effect size computed for the t test is equivalent to ____________.

Behavioral Research and the Scientific Method

From Hunches to Testable Hypotheses

Ethical Considerations and Guidelines

Carpenter, S 1998 Content Analysis Project for Research Novices Teaching of Psychology

Methods for Looking Within Ourselves

Reliability and Validity in Measurement and Research

Randomized Experiments and Causal Inference

Nonrandomized Research and Causal Reasoning

Survey Research and Subject Recruitment

Summarizing the Data

Correlating Variables

Understanding P Values and Effect Size Indicators

Comparisons of More Than Two Conditions

The Analysis of Frequency Tables

Filters