Ch. 1, Module 3: Statistics

A way of organizing numbers and summarizing them so that patterns can be determined.

• descriptive statistics

• inferential statistics

• statistics

• standard deviation

Statistical analysis of two or more sets of numerical data to reduce the possibility of error in measurement and to determine if the differences between the data sets are greater than chance variation would be perfect.

• descriptive statistics

• inferential statistics

• mean

• standard deviation

Branch of mathematics concerned with the collection and interpretation of numerical data.

• standard of deviation

• inferential statistics

• descriptive statistics

• statistics

The arithmetic average of a distribution of numbers.

• mean

• median

• mode

• range

The middle score in an ordered distribution of scores, or the mean of the two middle numbers; the 50th percentile.

• mean

• median

• mode

• range

The most frequent score in a distribution of scores.

• mean

• median

• mode

• range

The square root of the average squared deviations from the mean of scores in a distribution; measure of variability.

• inferential statistic

• statistics

• standard deviation

• validity

Referring to differences in data sets that are larger than chance variation would predict.

• reliability

• statistics

• statistically significant

• validity

The tendency of a test to produce the same scores again and again each time it is given to the same people.

• inferential statistics

• descriptive statistics

• validity

• reliability

The degree to which a test actually measures what it's supposed to measure.

• validity

• statistically significant

• standard deviation

• statistics