Chapter 3 Stats

Good to measure when there is an outlier

Median

The most appropriate measure of central tendency for gender

Mode

Median higher than mean

Negative Scew

3 Characteristics of Mean

1. Balances the scores 2. "Least squares Principle" --> best measure of variation 3. Affected by outliers (scews)

Outlier

An extreme deviation from the mean

Mean

Average (add up the numbers, divide by the number of numbers. Useful for interval/ ratio and sometimes ordinal.

Good to measure interval/ ratio

Mean

Median very close to mean

Normal Curve

Median lower than mean

Positive Scew

Median

The middle score in a distribution; half the scores are above it and half are below it. Useful for interval/ ratio and ordinal.

Mode

The most frequently occurring score(s) in a distribution; useful for nominal and interval/ ratio.

The median cannot be found for variables measured at the nominal level because

The scores cannot be ranked or ordered

When scewed

Use the median. Good when dealing with income.

Measures of Central Tendency

mean, median, mode