1. STEM AND LEAF DIAGRAMS Don’t forget to order Include a key

2. SCATTER DIAGRAMS Plot the points Line of best fit Positive and negative correlation

3. SIMPLE PROBABILITY Probabilities add to 1 Multiply the probability by the number of times

4. MEAN FROM A TABLE Multiply frequency by the value Divide this total by total frequency

5. QUESTIONNAIRES Look for a time limit in the question Overlap between the choices Any missing choices?

6. BOX PLOTS Plot 5 measures to draw it To compare, 1 comment on the median, 1 comment on the interquartile range (the width of the box)

7. CUMULATIVE FREQUENCY Running total Plot end points against cumulative frequency Measure median and quartiles

8. ESTIMATE OF THE MEAN 2 extra columns Use mid point of groups Mid point x frequency Big total divided by little total

9. HISTOGRAMS Frequency density is freq divided by class width The area of a bar is the frequency

10. PERCENTAGES Compound Interest means do it 1 year at a time Look for the word original Get 1% by dividing by 100

11. STRAIGHT LINES Look at the gradient – positive or neg Gradient is up divided by the across Line is y=mx+c, where m is the gradient and c the intercept