Statistics Quiz # 5

A relationship in which a high score on variable x will be associated with a high score on variable y is known as Strong Negative Relationship.

True

False

A relationship in which a low score on variable x will be associated with a low score on variable y is known as Strong Positive Relationship.

True

False

T distribution is a table of critical values that can be used to test the significance of_____

Correlation coefficient

Independent t test

Dependent t test

All of these

The correlation in which variable x may be related to y or the variable y may be related to x is known as_____

Pearson’s product–moment correlation

Zero-order correlation

Point-biserial correlation

Spearman’s Correlation

Correlation coefficient of effect size yields estimates that is _____ if used with large sample sizes.

Greater than Cohen’s d

Smaller than Cohen’s d

Equal to Cohen’s d

All of these

The value of Cohen’s d can be _____

Equal to 1.00

Equal to 10.0

Greater than 1.00

Smaller than 1.00

In Controlled Experiment an experimental group that receives some treatment is _____ variable

Dependent

Response

Independent

All of these

In Controlled Experiment, placebo is given to_____

Experimental group

Controlled group

Both of these

None of these

Effect sizes are typically reported as_____

Small

Medium

Large

All of these

Heterogeneity of Variance is a violation of the assumption that two groups have _____ variances in the independent groups t test.

Equal

Approximately equal

Unequal

Both a and b

An assumption in the independent groups t test and ANOVA that the two groups or more groups have equal or approximately equal variances is known as_____

Heterogeneity of Variance

Pooled Variance

Homogeneity of variance

None of these

In situ Design occurs often in t-test designs and ANOVAs where the participants are randomly assigned to the groups.

True

False

Independent Groups t Test is a statistical procedure designed to evaluate the difference between two groups’ means on a _____ variable.

Dependent

Response

Independent

Both a and b

A significant value of F in Levene’s test indicates that the two groups’ variances are significantly different from each other.

True

False

The _____ t test formula contains the pooled variance estimate.

Numerator of dependent

Numerator of independent

Denominator of dependent

Denominator of independent

Power is the probability that the null hypothesis will be _____

Accepted correctly

Accepted falsely

Rejected correctly

Rejected falsely

The standard for minimum power in psychological research is_____

8.0

0.80

80

0.08

The power of a test is estimated by _____

β

1 – β

β-1

0-β

Robustness is characteristic of statistical tests that indicates_____

The ability to detect a real difference between the two groups’ means

The ability to detect a false null hypothesis

The ability to detect whether a treatment or procedure really works

Both a and b

A test to determine whether there are significant differences between two independent groups’ means on the same dependent variable is known as _____

T test

Z test

ANOVA

Chi-square test

Dependent t Test is a test designed to determine the statistical difference between two means where the participants in each group are_____

Same persons

Closely matched pair

Different persons

Both a and b

In matched t Test the participants are paired or matched on some critical variables that are known to be related to the independent variable in the experiment.

True

False

What happens in the absence of order of presentation?

The participants may become fatigued or bored

Do more poorly in the later conditions

Perform well in the later conditions

Both a and b

According to regression effect people who first measure at the extreme end on a variable tend to have _____ scores later.

Higher

Lower

More moderate

All of these

Repeated measures t Test is used in_____design.

Pretreatment

Posttreatment

Both

None

ANOVA assesses the differences between two or more groups’ means by analyzing a ratio of variances____

Between groups

Within groups

Both

None

Between Groups Variance is a measure of the_____ between a series of groups’ means and the population mean.

Sum of differences

Square of differences

Sum of the squared differences

None of these

The Bonferroni correction does reduce the probability of the Type II error by unacceptably increasing the probability of the Type I error.

True

False

Causation may be implied between the independent and dependent variables from a completely randomized ANOVA design.

True

False

The value of eta in ANOVA ranges between_____

0.00-0.10

0.00-1.00

0.01-0.10

0.01-1.00