Question 1

If the sample size for both groups in an independent samples t test is n = 15, what degrees of freedom should be used?

Accepted Answer

A)  30 
B)  28 
C)  29 
D)  14 
A)  30 
B)  28 
C)  29 
D)  14

Question 2

Given a tcrit of -2.01 for an independent samples t test, which of the following obtained t-value will lead to the rejection of H₀?

Accepted Answer

A)  +2.88 
B)  -2.33 
C)  +2.41 
D)  -1.98 
A)  +2.88 
B)  -2.33 
C)  +2.41 
D)  -1.98

Question 3

The null hypothesis for an independent samples t test specifies

Accepted Answer

A)  no difference between population means. 
B)  no difference between sample means. 
C)  that there are significant differences between population means. 
D)  that there are significant differences between sample means. 
A)  no difference between population means. 
B)  no difference between sample means. 
C)  that there are significant differences between population means. 
D)  that there are significant differences between sample means.

Question 4

Which of the following is a nondirectional null hypothesis for an independent samples t test?

Accepted Answer

A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≠ μ₂ 
C)  H₀: μ₁ ≤ μ₂ 
D)  H₀: μ₁ > μ₂ 
A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≠ μ₂ 
C)  H₀: μ₁ ≤ μ₂ 
D)  H₀: μ₁ > μ₂

Question 5

If SS for group one is 32 and SS for group two is 51 and both groups are made up of 7 individuals, what is   ?

Accepted Answer

A)  6.08 
B)  1.76 
C)  1.39 
D)  2.47 
A)  6.08 
B)  1.76 
C)  1.39 
D)  2.47

Question 6

Describe in words what the null and alternative hypotheses state for a two-tailed independent samples t test.

Accepted Answer

The null hypothesis states that there wo

Question 7

An independent samples t test

Accepted Answer

A)  involves determining if a sample mean differs significantly from a population mean. 
B)  involves a single score from each subject. 
C)  involves a pre- and post-test score from each subject. 
D)  is also called a repeated measures test. 
A)  involves determining if a sample mean differs significantly from a population mean. 
B)  involves a single score from each subject. 
C)  involves a pre- and post-test score from each subject. 
D)  is also called a repeated measures test.

Question 8

The null hypothesis for an independent samples t test specifies _________________ and the alternative hypothesis specifies _________________.

Accepted Answer

A)  that sample means are not equal; no difference between sample means 
B)  no difference between sample means; that samples mean are not equal 
C)  that population means are not equal; no difference between population means 
D)  no difference between population means; that population means are not equal 
A)  that sample means are not equal; no difference between sample means 
B)  no difference between sample means; that samples mean are not equal 
C)  that population means are not equal; no difference between population means 
D)  no difference between population means; that population means are not equal

Question 9

The difference between M₁ and M₂ is 12. The pooled variance is 5. Which of the following can be used to determine Cohen's d for an independent samples t test?

Accepted Answer

A)  12/5 
B)  12/   
C)  5/12 
D)  5/   
A)  12/5 
B)  12/   
C)  5/12 
D)  5/

Question 10

Using symbolic notation, write the null and alternative hypotheses for a one-tailed independent samples t test for which the researcher expects the scores in condition one to be higher than the scores in condition two.

Accepted Answer

H₀: μ₁ ≤ μ

Question 11

If the alternative hypothesis is H₁: μ₁ > μ₂, then the null hypothesis would be _____________.

Accepted Answer

A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≠ μ₂ 
C)  H₀: μ₁ < μ₂ 
D)  H₀: μ₁ ≤ μ₂ 
A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≠ μ₂ 
C)  H₀: μ₁ < μ₂ 
D)  H₀: μ₁ ≤ μ₂

Question 12

What is the pooled variance if group one, made of up 9 individuals, has an SS value of 168 and group two, made up of 10 individuals, has a SS value of 201?

Accepted Answer

The answer of What is the pooled variance if group...

Question 13

The notation applies to a

Accepted Answer

A)  z-test. 
B)  one-sample t test. 
C)  two-sample t test, independent samples design. 
D)  two-sample t-test, related samples design. 
A)  z-test. 
B)  one-sample t test. 
C)  two-sample t test, independent samples design. 
D)  two-sample t-test, related samples design.

Question 14

If α = .01 and p > .01 for a two-tailed independent samples t test, then we can conclude that

Accepted Answer

A)  there was no difference between means. 
B)  we should fail to reject H₀. 
C)  there was a significant difference between means. 
D)  both "a" and "b" are correct. 
A)  there was no difference between means. 
B)  we should fail to reject H₀. 
C)  there was a significant difference between means. 
D)  both "a" and "b" are correct.

Question 15

Which of the following is a directional alternative hypothesis for an independent samples t test?

Accepted Answer

A)  H₁: μ₁ > μ₂ 
B)  H₁: μ₁ ≠ μ₂ 
C)  H₁: μ₁ ≤ μ₂ 
D)  H₁: μ₁ = μ₂ 
A)  H₁: μ₁ > μ₂ 
B)  H₁: μ₁ ≠ μ₂ 
C)  H₁: μ₁ ≤ μ₂ 
D)  H₁: μ₁ = μ₂

Question 16

Using the summary values that follow, conduct an independent samples t test with an ? = .05, two-tailed: M? = 90, n? = 18, M? = 98, n? = 16, sM?-M?=3.16.

Accepted Answer

Step 1:
H?: ? S1U1B11S1U1B0 = ??
H?: ?S1U1B11S1U1B0? ??

Step 2:
?

Question 17

The df value for an independent samples t-test is

Accepted Answer

A)  n - 1. 
B)  n - 2. 
C)  n₁ + n₂ - 2. 
D)  n₁ - n₂. 
A)  n - 1. 
B)  n - 2. 
C)  n₁ + n₂ - 2. 
D)  n₁ - n₂.

Question 18

Using symbolic notation, write the null and alternative hypotheses for a two-tailed independent samples t test.

Accepted Answer

H₀: μ₁ = μ

Question 19

Which of the following is a directional null hypothesis for an independent samples t test?

Accepted Answer

A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≤ μ₂ 
C)  H₀: μ₁ ≠ μ₂ 
D)  H₀: μ₁ > μ₂ 
A)  H₀: μ₁ = μ₂ 
B)  H₀: μ₁ ≤ μ₂ 
C)  H₀: μ₁ ≠ μ₂ 
D)  H₀: μ₁ > μ₂

Question 20

The correct notation for the standard error value for an independent samples t test is __________.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

If the sample size for both groups in an independent samples t test is n = 15, what degrees of freedom should be used?

Given a t_crit of -2.01 for an independent samples t test, which of the following obtained t-value will lead to the rejection of H₀?

The null hypothesis for an independent samples t test specifies

Which of the following is a nondirectional null hypothesis for an independent samples t test?

If SS for group one is 32 and SS for group two is 51 and both groups are made up of 7 individuals, what is ?

Describe in words what the null and alternative hypotheses state for a two-tailed independent samples t test.

An independent samples t test

The null hypothesis for an independent samples t test specifies _ and the alternative hypothesis specifies _.

The difference between M₁ and M₂ is 12. The pooled variance is 5. Which of the following can be used to determine Cohen's d for an independent samples t test?

Using symbolic notation, write the null and alternative hypotheses for a one-tailed independent samples t test for which the researcher expects the scores in condition one to be higher than the scores in condition two.

If the alternative hypothesis is H₁: μ₁ > μ₂, then the null hypothesis would be _____________.

What is the pooled variance if group one, made of up 9 individuals, has an SS value of 168 and group two, made up of 10 individuals, has a SS value of 201?

The notation applies to a

If α = .01 and p > .01 for a two-tailed independent samples t test, then we can conclude that

Which of the following is a directional alternative hypothesis for an independent samples t test?

Using the summary values that follow, conduct an independent samples t test with an ? = .05, two-tailed: M? = 90, n? = 18, M? = 98, n? = 16, sM?-M?=3.16.

The df value for an independent samples t-test is

Using symbolic notation, write the null and alternative hypotheses for a two-tailed independent samples t test.

Which of the following is a directional null hypothesis for an independent samples t test?

The correct notation for the standard error value for an independent samples t test is __________.

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

Exam 10: Two-Sample T-Test: Independent Samples Design

If the sample size for both groups in an independent samples t test is n = 15, what degrees of freedom should be used?

Given a tcrit of -2.01 for an independent samples t test, which of the following obtained t-value will lead to the rejection of H₀?

The null hypothesis for an independent samples t test specifies

Which of the following is a nondirectional null hypothesis for an independent samples t test?

If SS for group one is 32 and SS for group two is 51 and both groups are made up of 7 individuals, what is ?

Describe in words what the null and alternative hypotheses state for a two-tailed independent samples t test.

An independent samples t test

The null hypothesis for an independent samples t test specifies _________________ and the alternative hypothesis specifies _________________.

The difference between M₁ and M₂ is 12. The pooled variance is 5. Which of the following can be used to determine Cohen's d for an independent samples t test?

Using symbolic notation, write the null and alternative hypotheses for a one-tailed independent samples t test for which the researcher expects the scores in condition one to be higher than the scores in condition two.

If the alternative hypothesis is H₁: μ₁ > μ₂, then the null hypothesis would be _____________.

What is the pooled variance if group one, made of up 9 individuals, has an SS value of 168 and group two, made up of 10 individuals, has a SS value of 201?

The notation applies to a

If α = .01 and p > .01 for a two-tailed independent samples t test, then we can conclude that

Which of the following is a directional alternative hypothesis for an independent samples t test?

Using the summary values that follow, conduct an independent samples t test with an ? = .05, two-tailed: M? = 90, n? = 18, M? = 98, n? = 16, sM?-M?=3.16.

The df value for an independent samples t-test is

Using symbolic notation, write the null and alternative hypotheses for a two-tailed independent samples t test.

Which of the following is a directional null hypothesis for an independent samples t test?

The correct notation for the standard error value for an independent samples t test is __________.

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

Given a t_crit of -2.01 for an independent samples t test, which of the following obtained t-value will lead to the rejection of H₀?

The null hypothesis for an independent samples t test specifies _ and the alternative hypothesis specifies _.