stats test 2

Distribution

a set of scores.

Range

The lowest and highest scores.

Clustering

Where many scores gather.

Spacing

How evenly scores are spread.

Variability

how scores differ

frequency distribution

how often each score appears.

Frequency

how often a score appears

Cumulative percentage

The percentage up to and including that score

x-axis

shows the score

y-axis

shows the frequency

symmetrical distribution

looks similar on both sides of the middle

skewed distribution

not balanced.

positive skew

has a tail toward the high-score side.

negative skew

tail toward the low-score side

Central tendency

where the scores are.

mean

the average.

median

the middle score

mode

the score that appears most often.

interquartile range

shows the spread of the middle 50% of scores

Variance

how far scores are spread around the mean

deviation

the distance between one score and the mean

standard deviation

the square root of the variance.

z-score

how many standard deviations a score is above or below the mean.