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