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Exam 11: Correlated Groups T-Test

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Question 31

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A sampling distribution of the mean of difference scores can be defined as a _____ distribution consisting of mean difference scores across individuals for all possible random samples of a given size that could be selected from a population.

A) skewed
B) bimodal
C) normal
D) theoretical

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Question 32

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If the sample size of a study is small and a high value of eta squared is observed,but there is no statistically significant effect of the independent variable on the dependent variable,we may conclude that ______.

A) a mistake has been made since you can't get a strong relationship when the t is nonsignificant
B) unless a larger sample is used we can't be certain about the effects of the independent variable
C) although the sample is small,the strong relationship indicates there is an effect due to the independent variable
D) the nonsignificant finding should be taken as conclusive evidence of no effect of the independent variable

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Question 33

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If the researcher suspects that the strength of the relationship between two variables in the population is .07,what sample size should she use per group in a study involving two correlated groups and an alpha level of .05,nondirectional test,in order to achieve a power of .70?

If we were to compute the average nullified score for each research participant,we would find that every person would have the same average score.

A sampling distribution of the mean of difference scores can be defined as a theoretical distribution consisting of mean difference scores across individuals for all possible random samples of a given size that could be selected from a population.

When we fail to reject the null hypothesis,the question of the nature of the relationship is:

A correlated groups t-test provides a more sensitive test of the relationship between the independent and dependent variables.

The mean of the sampling distribution of mean difference scores is equal to the _____ across individuals in the population.

The analysis of the nature of the relationship for the _____ involves examination of the mean scores for the two conditions.

The correlated groups t test is typically used to analyze the relationship between two variables when:

Which of the following statements describes a correlated-groups t test null hypothesis?

Usually,the correlated groups t test provides a _____ test of the relationship between the independent and dependent variables than does the independent groups t test.

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards) .She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. What is the strength of the relationship of the data above?

A reading readiness test is administered to 8 matched pairs of first graders.One child of each pair had 3 years of day care experience whereas the other child had none.The results of the test are shown in the following table.(Higher scores indicate greater readiness. ) Assume á=.05,nondirectional test. The critical t for this problem is ______.

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.What type of statistical test should Dr.Hinson use in analyze his data?

Within subjects designs have several advantages which include_____.

In most behavioral science research,the estimated standard error for the correlated groups t test is _____ than the estimated standard error for the independent groups t test applied to the same data.

The standard deviation of the sampling distribution of mean difference scores is referred to as the _____ of difference scores.

When using a correlated-groups t test design,we calculate the degrees of freedom using ______,where N= number of difference scores.

Using Appendix