In tilton school there are 380 students in key stage 3
240 students in key stage 4
110 students in ket stage 5
phoebe is carring out a survey she needs a sample of 100 students stratified by key stage 3 there should be in the sample

As a manufacturer of golf equipment, the spalding corporation wants to estimate the proportion of golfers who are left-handed. how many golfers must be surveyed if we want 99% confidence that the sample proportion has a margin of error of 0.025? assume that a previous study suggests that 20% of golfers are left-handed.