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

11
STEM AND LEAF DIAGRAMS Don’t forget to order Include a key

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

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

STEM AND LEAF DIAGRAMS

• Don’t forget to order

• Include a key

Page 2: 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

Page 3: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

SIMPLE PROBABILITY

•Probabilities add to 1•Multiply the probability by the number of times

Page 4: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

MEAN FROM A TABLE

•Multiply frequency by the value•Divide this total by total frequency

Page 5: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

QUESTIONNAIRES

•Look for a time limit in the question•Overlap between the choices•Any missing choices?

Page 6: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

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)

Page 7: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

CUMULATIVE FREQUENCY

•Running total•Plot end points against cumulative frequency•Measure median and quartiles

Page 8: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

ESTIMATE OF THE MEAN

•2 extra columns•Use mid point of groups•Mid point x frequency•Big total divided by little total

Page 9: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

HISTOGRAMS

•Frequency density is freq divided by class width•The area of a bar is the frequency

Page 10: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

PERCENTAGES

• Compound Interest means do it 1 year at a time

•Look for the word original

• Get 1% by dividing by 100

Page 11: STEM AND LEAF DIAGRAMS Don’t forget to order Include a key.

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