STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.
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Transcript of STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.
STEM AND LEAF DIAGRAMS
• Don’t forget to order
• Include a key
SCATTER DIAGRAMS
•Plot the points•Line of best fit•Positive and negative correlation
SIMPLE PROBABILITY
•Probabilities add to 1•Multiply the probability by the number of times
MEAN FROM A TABLE
•Multiply frequency by the value•Divide this total by total frequency
QUESTIONNAIRES
•Look for a time limit in the question•Overlap between the choices•Any missing choices?
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)
CUMULATIVE FREQUENCY
•Running total•Plot end points against cumulative frequency•Measure median and quartiles
ESTIMATE OF THE MEAN
•2 extra columns•Use mid point of groups•Mid point x frequency•Big total divided by little total
HISTOGRAMS
•Frequency density is freq divided by class width•The area of a bar is the frequency
PERCENTAGES
• Compound Interest means do it 1 year at a time
•Look for the word original
• Get 1% by dividing by 100
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