Distribution Flashcards
How can the measures of central tendency be presented?
In frequency polygons.
What does normal distribution look like?
A bell-shaped curve.
How does normal distribution occur?
If a large data set has been collected and the mean, mode and median are at the highest peak (they’re the same value).
What is skewed distortion?
When most scores are grouped towards one end and the mean, mode and median fall at different points.
What is a negative skew?
When the mean is a lower value than the mode and the mode is a lower value than the median (mean -> mode -> median)
This is illustrated by a longer tail to the left.
What is a positive skew?
When the mean is a higher value than the median and the median is a higher value than the mode.
(mode -> median -> mean)
It is illustrated by a longer tail to the right.
What do psychologists expect to happen with distribution?
They expect that variables will be normally distributed across the population.
