ES 350 ole miss

A variable that is a moderator is one that

A variable that is a moderator is one that

A statistical test that provides information about the relationship between two continuous variables is.

Person product moment coefficient of correlation

Which one of the following statements does not describe an advantage of repeated measures?

Repeated measures can eliminate the influence of some unwanted variable.

imagine you are rolling a 10-sided die that is equally weighted and with each side showing a number from one to ten. If you roll the die 10 times and you roll a three 4 of those 10 time, what does this tell you

The relative frequency may not be the same as the theoretical frequency

In logistic regression, one is able to predict

a continuous variable

When the purpose of the research is to determine the effects of one independent variable (e.g., four groups) on one dependent variable (e.g., self-concept), the best choice of a statistical analysis is

analysis of variance

The researcher obtained a significant F from the ANOVA. Partial 2 was found to be .30. This is interpreted to mean that

30% of the total variance is accounted for by the treatment

In multiple regression, one is able to predict

one criterion from two or more predictors

if the researcher fails to reject the null hypothesis when there really is a difference, this is an example of a

type ii error

For a group of normally distributed scores with a mean of 30 and a standard deviation of 6, the middle 68% of the scores will be between

24 and 36

A researcher finds a correlation of .70 between popularity ratings and self-concept scores. What percentage of common association can be inferred between the two variables?

49%

why can't you just run multiple t-tests instead of running a ANOVA (a post-hoc tests if overall ANOVA is significant?)

Because you would be inflating your type 1 error rate (i.e., mistakenly increasing chances of finding statistical significance)

If the null hypothesis is false, one may assume the research hypothesis is the explanation for the results if

all other possible explanations have been controlled

A researcher sought to find out which of two exercises was more effective in building endurance. One group used exercise A, and another group used exercise B. At the end of study, the researcher should compare the two groups' scores with

an independent samples t test

Prediction studies use which of the following as the basic analysis technique?

correlation

A Pearson's correlation of .00 between two variables indicates?

independence (no association) between the variable

If two measures have a high positive correlation, and a person has a low score on one measure, her score on the other measure is most likely to be

low

In discriminant function analysis, one is able to predict

membership in one of three or more groups

Power is defined as the probability of

rejecting a false null hypothesis

to determine whether data are normally distributed, one can test to see whether the curve is shifted to the left or right. This shift is called

skewness

The standard deviation represents the

spread of scores about the mean

After a population of 1,000 high school seniors is divided by sex and size of school attended, the random selection of a sample to represent these proportions of the population is called

stratified random sampling