A population may contain separate groups or strata. Each group needs to be fairly represented in the sample. The number from each group is proportional to the group size. The selection is then made at random from each group, this is called stratified sampling, and I need to use this to make sure my results represents each group fairly, the equation I need to use is: No. Of pupils in specific data X Sample No. …showed first 75 words of 2056 total…

…showed last 75 words of 2056 total…data. 3.<Tab/>The data is always grouped. You can use equal width groups or unequal width groups, I will use equal group widths. I will draw 6 Histograms 3 for height (boys, girls and mixed) and 3 for weight (boys, girls and mixed). (see page ) From these histograms you get the same information you got for the box plots, this information in the histogram is to back up the information in the box plots.