Question 1

1.00 minus eta-squared represents the proportion of variability in the dependent variable that is not associated with the independent variable--that is,the proportion of sample variability that is due to disturbance variables.

Accepted Answer

This is a correct explanation of what 1.00 minus eta-squared represents.

Question 2

The 95% confidence interval including the upper and lower limits,contains the_______.

Accepted Answer

The answer of The 95% confidence interval including the upper...

Question 3

Eta-squared is a biased estimator in that it tends to slightly underestimate the strength of the relationship in the population across random samples.

Accepted Answer

Eta-squared tends to overestimate the strength of the relationship in the population because it is based on sample data and does not account for variability that would be present in the entire population.

Question 4

If the sample size is different in the treatment and control groups then weighted variances should be used.

Accepted Answer

Weighted variances should be used when the sample size is different in the treatment and control groups to account for the unequal representation of each group.

Question 5

The estimated standard error of the difference is only influenced by the sample size.

Accepted Answer

The estimated standard error of the difference is influenced by both the sample size and the variability (standard deviation) of the population from which the samples are drawn.

Question 6

It is important to calculate the _________even if the results indicate there is not a significant difference between groups.

Accepted Answer

The answer of It is important to calculate the _________even...

Question 7

For a nondirectional alternative hypothesis it is written as H₁: ì₁ ? ì_2.

Accepted Answer

This is a valid format for a nondirectional alternative hypothesis, where H₁ represents the alternative hypothesis and ì₁ and ì_2. represent the means of two populations being compared.

Question 8

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

Accepted Answer

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

Question 9

Unexplained error or variance may be due to_________.

Accepted Answer

The answer of Unexplained error or variance may be due...

Question 10

If there is equal variance in groups or homogeneity of variance then the variance would be ó₁² = ó₂² = ó^2.

Accepted Answer

This is true. When there is equal variance in groups or homogeneity of variance, the formula for the variance of the population (σ²) is simplified to σ² = σ²(S1U1B) = σ²(S1U1P), where S1U1B is the variance between groups and S1U1P is the variance within groups. This can be further simplified to σ²(S1U1B) = σ²(S1U1P) = σ²(S1U1P + S1U1B) / 2.

Question 11

The_______tells you how much variance can be explained by the affect independent variable had on the dependent variable.

Accepted Answer

The answer of The_______tells you how much variance can be...

Question 12

When is the independent groups t test used to analyze the relationship between two variables?

Accepted Answer

The answer of When is the independent groups t test...

Question 13

Given that your calculated t is 5.09 and there was a total of 62 subjects the strength of the relationship is_________.

Accepted Answer

The answer of Given that your calculated t is 5.09...

Question 14

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 15

The standard deviation of the sampling distribution of the differences between 2 means is referred to as_________.

Accepted Answer

The answer of The standard deviation of the sampling distribution...

Question 16

If the assumption of homogeneity of variance is violated a nonparametric test has to be used.

Accepted Answer

Violating the assumption of homogeneity of variance does not necessarily require the use of a nonparametric test; alternatives include transforming the data or using statistical tests robust to this violation, such as Welch's t-test.

Question 17

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

Accepted Answer

Eta-squared ranges from 0 to 1, where values close to 0 indicate a small effect size and values close to 1 indicate a large effect size. Negative values are not possible.

Question 18

The test used to determine homogeneity of variance is called_________.

Accepted Answer

The answer of The test used to determine homogeneity of...

Question 19

Increasing ______ reduces the standard error of the difference.

Accepted Answer

The answer of Increasing ______ reduces the standard error of...

Question 20

What is a sampling distribution of the difference between two independent means?

Accepted Answer

The answer of What is a sampling distribution of the...

Quiz 10: Independent Groups T -Test