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