Psych 1 - Module 4

The overall purpose of statistics is to

• discover how two variables are related

• determine statistical significance

• identify the center of a distribution of numbers

• make numbers meaningful

Bar graphs are most closely related to

• correlation coefficients

• frequency distributions

• statistical significance

• standard deviations

When a distribution of data is skewed, the best measure of central tendency is the

• median

• mean

• range

• standard deviation

A limitation of the range is that it

• considers only two pieces of data.

• cannot be used as a measure of variation

• may provide a false indication of statistical significance

• is too difficult to calculate

A statistic that always gets larger as data become less consistent is the

• mean

• percentile

• median

• standard deviation

Scores that are three standard deviations above the mean are

• much more common than scores that are three standard deviations below the mean

• an indication of statistical significance

• rare

• an indication of positive correlation

A student who scores at the 50th percentile on a test has scored at the

• mode

• median

• standard deviation

• mean

A scatterplot is a visual representation of

• statistical significance

• a standard deviation

• a correlation

• percentage scores

Which of the following can never be a correlation coefficient?

• r = - 1.00

• r = + 0.85

• r = + 2.00

• r = - 0.01

Which of the following does not contribute to statistical significance?

• the correlation coefficients of the two groups

• the number of participants

• the standard deviations of the two groups

• the difference between the two groups' means