Experimental Psychology Study Set 1

The two properties about a set of measurements of a dependent variable that we are most interested in describing are

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

The generally preferred measure of central tendency is usually the

The mean is

The ______________ divides a distribution in half.

An advantage of the median over the mean is that the median is

Which of the following is the most useful descriptive statistic for measuring dispersion?

The standard deviation is

All of the following statements are true of the normal distribution EXCEPT

A score that lies one standard deviation above the mean

If the mean I.Q. score is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z-score (or standard score) of

Inferential statistics allow you to decide whether a difference between the experimental and the control group is due to _______________ or ________________.

The ___________ is the standard deviation of sample means.

The null hypothesis suggests that the two samples come from ___________ distribution(s), and the experimental hypothesis suggests that the two samples come from _____________ distribution(s).

In comparison with a confidence level of 0.05, a confidence level of 0.01 means

Rejecting the null hypothesis when it is actually false is

Failing to reject the null hypothesis when it is actually true is a

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

A conservative statistical test is one that

As the sample size (n) increases,