Psych Stats Final Exam

Outliers can change the _____ of a correlation.

- direction - strength - sign (+, -)

A researcher computes a one-way within-subjects ANOVA, thus:

-The same participants were observed in each group. -At least two groups were observed in the study. -A repeated measures design was likely used.

How many sources of error are present in a one-way within-subjects ANOVA?

2

T/F For a within-subjects design, the degrees of freedom between groups is always equal to the degrees of freedom between-persons.

False

T/F The coefficient of determination is the square root of the correlation coefficient.

False

T/F The degrees of freedom for a one-way between-subjects ANOVA is the sample size minus one.

False

A researcher increases his level of confidence from 90% to 95%. What will happen to the precision of his estimate?

The estimate will be less precise.

characteristic of confidence intervals

The less certain an estimate, the more precise the estimate. The more certain an estimate, the less precise the estimate.

T/F Mean square error is the denominator for all one-way ANOVA tests.

True

T/F The sign (+ or -) of a correlation coefficient indicates the direction of a relationship between two factors.

True

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

a confound variable

The degrees of freedom for error is called

degrees of freedom error degrees of freedom denominator degrees of freedom within-groups

T/F A significant ANOVA indicates that all pairs of group means significantly differ.

false

For the one-way within-subjects ANOVA, the more ________ participant responding between groups, the less powerful the test will be at detecting an effect.

inconsistent

Without changing the value of error variance, the ________ the between-groups variability, the more likely we are to reject the null hypothesis.

larger

The confidence interval for samples selected from a population with an unknown variance is computed using critical values from the t table. This is true for which of the following types of samples?

one-sample two-independent sample related samples

The correlation coefficient measures the extent to which changes in one factor are _______ in a second factor.

related to changes

The most common measure of effect size for the correlation coefficient is called

the coefficient of determination

The source of variability associated with error variance in the one-way between-subjects ANOVA is called

within-groups variability

T/F The estimated standard error is used in the formula to estimate the population mean for the one-sample t.

true