AP Psychology Stats

A carefully worded statement of the exact procedures used in a research experiment is known as

• replication

• operational definition

• hypothesis

• standardization

A computed measure of how much scores vary around the mean score dependent on the range and square root of total scores.

• inferential statistic

• standard deviation

• descriptive research

• average

When scores are "bunched up"in the center of a distribution, the

• mean will be relatively low

• standard deviation will be relatively low

• correlation coefficiaent will be a negative number

• standard deviation will be relatively high

Which of the following correlation coefficients expresses the weakest degree of relationship between two variables?

• -0.12

• +1.00

• -0.99

• +0.25

• -0.50

Megalethia claims that her psychological research is “valid”. What does she mean?

• The study was successful

• The study proved her hypothesis

• The study failed

• The study was done in a lab

• The study measures what it claims to measure

what is single blind?

• research method in which a researcher manipulates one or more factors while controlling others

• assigning participants to experimental/control group by chance.

• an observation technique in which one person is studied in depth in the hope of revealing universal principles. If the individual studied is atypical, the results may be misleading.

• A research method that helps reduce the chance that participants will guess what a study is about.

The difference between the highest and lowest scores in a distribution.

• standard deviation

• variance

• range

• dependent variable

The score that occurs most frequently

• mean

• median

• mode

• standard deviation

Which of the following is the mode for the data set: 4, 4, 5, 6, 7, 7, 7, 8, 9?

• 4

• 7

• 9

Which of the following is the median for the data set: 4, 4, 5, 6, 7, 7, 7, 8, 9?

• 4

• 7

• 9