Descriptive Stats 2

Graphical Rep: histograms/boxplots

Generally used to analyse and explore data, bar + line charts used to present summarised results to others

Line charts

-Normally used to show change (e.g. of means) from one “condition” to
another, or over a time period

-Always make sure that charts have clear axes titles + a clear figure heading

Normal distribution chars

-Symmetrical about mid point of horizontal axis

-M = mean/median/mode

-Tails never quite meet horizontal axis

-Area under curve = known units of standard deviations/z scores

-In inferential stats, sometimes assume population values for psy variables form normal distribution

Positively skewed

Towards Y axis

Negatively skewed

Towards right

Z-score

One standard deviation from mean