Question 1

The total variability in the dependent variable,as represented by SSTOTAL,can be split up,or partitioned,into two components,one (SSEXPLAINED)reflecting the influence of the independent variable and one (SSERROR)reflecting the influence of disturbance variables.

Accepted Answer

A) True 
 B)False

Question 2

SSEXPLAINED represents

Accepted Answer

A) the total amount of variability that exists in the data when the scores for both groups are combined. 
B) the variability associated with the independent variable. 
C) the variability associated with factors other than the independent variable. 
D) the variability associated with the dependent variable.

Question 3

How do we determine what the nature of the relationship is between two variables?

Accepted Answer

The answer of How do we determine what the nature...

Question 4

Which of the following conditions would make it inappropriate to use an independent-groups t test?

Accepted Answer

A) when the independent variable is qualitative 
B) when the independent variable is within-subjects 
C) when the independent variable is quantitative 
D) when the dependent variable is measured on a level that approximates interval characteristics

Question 5

Eta-squared can range from -1.0 to +1.0.

Accepted Answer

A) True 
 B)False

Question 6

The standard deviation of the sampling distribution of the difference between two independent means is called the standard error of the difference between two independent means or,more simply,the standard error of the difference.

Accepted Answer

A) True 
 B)False

Question 7

The nature of the relationship in the independent groups t-test is determined by examining___.

Accepted Answer

The answer of The nature of the relationship in the...

Question 8

The proportion of sample variability in the dependent variable that is explained by the independent variable is called eta-squared.

Accepted Answer

A) True 
 B)False

Question 9

The null hypothesis for an independent groups t test states that _____.

Accepted Answer

A) the population mean scores for each level of the independent variable are the same 
B) the two groups have different population means on the dependent variable 
C) the independent and dependent variables are related 
D) the population variances are the same

Question 10

A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (XS)and large-boned frame (XL).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data: 
What is the null hypothesis?

Accepted Answer

A) µS = µL 
B) µS  
ΜL 
C) µS L 
D) µS > µL

Question 11

As the alpha level becomes larger,the power of a statistical test ____.

Accepted Answer

A) will decrease 
B) will increase 
C) remains the same 
D) may decrease

Question 12

The degrees of freedom associated with independent Groups t-test is_________.

Accepted Answer

The answer of The degrees of freedom associated with independent...

Question 13

What is the rationale for calculating eta-squared following a nonsignificant statistical test?

Accepted Answer

The answer of What is the rationale for calculating eta-squared...

Question 14

The nature of the relationship in the independent groups t test is determined by examining:

Accepted Answer

A) eta-squared 
B) omega-squared 
C) sample means 
D) population means

Question 15

Given the following information,find eta2.SSTOTAL = 653,SSERROR = 405,SSEXPLAINED = 248.

Accepted Answer

A) .38 
B) .61 
C) .62 
D) 653

Question 16

The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

Accepted Answer

A) 2.6672/(2.6672 + 16) 
B) 2.1202/(2.1202 + 16) 
C) .05 
D) 2.6672/2.667 + 18

Question 17

Given the following information,find eta2.t = 2.5,n1 = 20,n2 = 18

Accepted Answer

A) .06 
B) .13 
C) .15 
D) .26

Question 18

Treatment effects are defined as the difference between a given _____ and the _____.

Accepted Answer

A) grand mean;population mean 
B) sample mean;population mean 
C) group mean;grand mean 
D) raw score;group mean

Question 19

The standard error of the difference becomes smaller as sample sizes _____ and the variability of the populations_____.

Accepted Answer

A) increase;increases 
B) increase;decreases 
C) decrease;decreases 
D) decrease;increases

Question 20

The independent groups t test requires that n1 equal n2.

Accepted Answer

A) True 
 B)False

Exam 10: Independent Groups T -Test

The total variability in the dependent variable,as represented by SS_TOTAL,can be split up,or partitioned,into two components,one (SS_EXPLAINED)reflecting the influence of the independent variable and one (SS_ERROR)reflecting the influence of disturbance variables.

SS_EXPLAINED represents

How do we determine what the nature of the relationship is between two variables?

Which of the following conditions would make it inappropriate to use an independent-groups t test?

Eta-squared can range from -1.0 to +1.0.

The standard deviation of the sampling distribution of the difference between two independent means is called the standard error of the difference between two independent means or,more simply,the standard error of the difference.

The nature of the relationship in the independent groups t-test is determined by examining___.

The proportion of sample variability in the dependent variable that is explained by the independent variable is called eta-squared.

The null hypothesis for an independent groups t test states that _____.

As the alpha level becomes larger,the power of a statistical test ____.

The degrees of freedom associated with independent Groups t-test is_________.

What is the rationale for calculating eta-squared following a nonsignificant statistical test?

The nature of the relationship in the independent groups t test is determined by examining:

Given the following information,find eta².SS_TOTAL= 653,SS_ERROR= 405,SS_EXPLAINED= 248.

The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

Given the following information,find eta².t = 2.5,n₁ = 20,n₂ = 18

Treatment effects are defined as the difference between a given _ and the _.

The standard error of the difference becomes smaller as sample sizes _ and the variability of the populations_.

The independent groups t test requires that n₁ equal n₂.