Exam 15: Appendices a and B Descriptive and Inferential Statistics

The null hypothesis can be rejected if the alpha value is less than or equal to .05.

A type 2 error occurs when we falsely reject the null hypothesis when it is actually false.

Parametric statistical tests assume that the level of measurement is at least an interval scale.

In a factorial ANOVA with repeated measures,error variance for the F ratios is estimated by the interaction of subjects within treatments.

The standard deviation is:

Which of the following is the most useful descriptive measure of dispersion?

In a normal distribution,the mean,median,and mode have the same value.

The ____ is the sum of all scores divided by the number of scores.

A sample is a subset of the population.

As the size of a sample increases,the ____ of the distribution of sample means becomes ____.

The power of a statistical test determines how likely it is that the null hypothesis will be rejected.

If an obtained score has a z-value of two or greater,then this score is greater than about 95% of all scores.

A sample is to a population as a ____ is to a(n)____.

In a histogram,frequency of scores is on the abscissa.

The mode is:

In a 2 $\times$ 2 factorial ANOVA,there are four F ratios that are of importance.

If the mean score is 200 and the standard deviation is 50,then a score of 50 is one standard deviation below the mean.

Statistical tests that increase type 1 errors tend to decrease type 2 errors.

Statistically significant effects can vary in their strength,which is measured by:

The within-subjects t-test is used for the same kind of experimental design that the Wilcoxon test is used.