Question 1

The test used to determine homogeneity of variance is called_________.

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

Question 2

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

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

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

The answer of Eta-squared is a biased estimator in that...

Question 4

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

Accepted Answer

When there is equal variance in groups, the variance of the sample means (S1U1B1 and S1U1B0 in this case) and the variance of the individual scores (S1U1P1 and S1P0) are equal. Therefore, the formula for the variance of the sample means can be simplified to óS1U1P1^2/S1S1P0, which is the same as óS1U1B1^2/S1S1P0 and óS1U1B0^2/S1S1P0.

Question 5

Increasing ______ reduces the standard error of the difference.

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

Question 6

Unexplained error or variance may be due to_________.

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

Question 7

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

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

Question 8

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

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

Question 9

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

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

Question 10

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

Accepted Answer

If the assumption of homogeneity of variance is violated, one can use parametric tests with corrections for unequal variances, such as the Welch's t-test or the Brown-Forsythe test. Nonparametric tests are not necessarily required in this case.

Question 11

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 12

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 samples.

Question 13

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 statement is true. Eta-squared represents the proportion of variability in the dependent variable that is associated with the independent variable, so 1.00 minus eta-squared would represent the proportion that is not associated with the independent variable. This is also known as the proportion of unexplained variance or variability due to disturbance variables.

Question 14

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

Accepted Answer

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

Question 15

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 HS represents the null hypothesis and ì₁ represents the alternative hypothesis. The dot (.) usually separates the null and alternative hypotheses.

Question 16

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

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

Question 17

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

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

Question 18

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

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

Question 19

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 weighting of the observations.

Question 20

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

Accepted Answer

Eta-squared is a measurement of effect size that ranges from 0 to 1. It cannot be negative, so it cannot range from -1 to +1.

Quiz 10: Independent Groups T-Test