Descriptive statistics

• Measure of central tendency- measure of the average value in a data set including mean, median and mode.
• Measure of dispersion- any measure of the spread in a set of scores.
• Standard deviation- how spread the data is from the mean
• Range- difference between highest and lowest score
• Mode- most frequent score
• Median- middle point of a distribution
• Mean- sum of all values divided by number of observations
• Graphs- Bar chart, Histogram and scattergraph
• Scatter graph- shows relationship between two variables
• Bar charts- used to show frequency or percentage distributions
• Histogram- bar chart with continuous variable on x axis
• Normal distribution - the mean median and mode all occupy the same midpoint of the curve
• Negative distribution- The long tail is on the left side of the peak and distribution concentrated on the right
• Positive distribution- The long tail is on the right side of the peak and distribution concentrated on the left