... a fixed percentage out of the 1183 students uses a sample size. For example 10% is taken from the whole school. You would end up with 118 students. On the other hand a percentage sample can be taken if the school is divided in strata. For example, if 10% is taken from every year group: Year group Total number of students Sample of 10% 7 282 282 x 0.1= 28.2 8 270 270 x 0.1 = 27 9 261 261 x 0.1 = 26.1 10 200 200 x 0.1 = 20 11 170 170 x 0.1 = 17 From this we learn how many pupils need to be taken from each year group. In both cases when the percentage is decided and the number is worked out, it is up to you to decide if you pick your students selectively or randomly. For example you could take 118 students by using the random function on your calculator. After my samples are selected, in any of the ways above, I will have ...

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