PSYC 4005 Statistics Quiz

That there is a difference between the three exercise conditions

A professor is interested in whether or not exercise can help students perform better on their exams. The professor runs an experiment in which participants are randomly assigned to one of three conditions. In-between studying for and taking a test, participants either do: 1) cardio, 2) resistance training, or 3) control/rest. The professor conducts an ANOVA, which produces the output F (2, 94) = 5.67, p < .05. Based upon the results of the ANOVA, you would conclude:

repeated-measures design

A research design where all participants experience each level of the independent variable is known as a _______________?

Type 2

Failing to reject the null hypothesis when it is actually false constitutes a __________ error

There is no difference between group means

In Null Hypothesis Significance Testing (NHST), the null hypothesis is typically:

Interaction

In designs with multiple independent variables, it is possible that the effect of one IV changes depending upon the level of another IV. This is known as a/an:

7.3

Please calculate the mean of the following number set: 15, 3, 3, 6, 3, 11, 12, 4, 7, 9.

Type 1

Rejecting the null hypothesis when it is actually true constitutes a ___________ error

standard deviation

The _________ tells us how individual scores vary around the average, and serves as a measure of variability in the date

mean

The ____________ tells us the average score of participants on a measure

effect size

The _______________ is a measure of the magnitude in the difference between experimental groups caused by the independent variable

The scores in Dataset A tend to be closer to the mean than the scores in Dataset B

Two different sets of data have the same mean value, but different standard deviations. The standard deviation for Dataset A is small, while the standard deviation for Dataset B is large. Outliers have been accounted for. Based upon just this information, what can you say about these two datasets?

the probability that the null hypothesis is true

What does a p-value tell us?

ANOVA

When comparing the means of three or more groups, which of the following statistical tests would be most appropriate?

dependent samples t-test

When comparing the means of two groups in a repeated measured design, the appropriate statistical test to use is:

F-statistic

the output of an ANOVA is known as a/an:

That there is no difference between the three participant groups

A researcher is hired to test whether or not a popular new vitamin drink can help facilitate memory. The researcher recruits participants and gives them all a memory test. She then sorts them into three groups based on their reported consumption of the drink: 1) those who have never tried the drink, 2) those who have tried it but do not consume it regularly, and 3) those who consume the drink regularly. The researcher conducts an ANOVA, which produces the output F (2, 67) = 2.79, p = .44. Based upon the results of the ANOVA, you would conclude:

.05

Alpha established a "cut-off" value for determining a significant p-value, and by convention is traditionally set as _________?