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    It's a method of working out how many people of a particular characteristic (exam boards like the characteristic of same year group) would be in a random sample out of everyone.

    You work it out really easily by using the following formula:

    number of people in group / total population x sample size

    For example, a question may ask: how many year 9 girls will be in a sample of 50 students?

    After this, there will most likely be a table where you will be given or have to work out the total number of students by simply adding up, and then looking at how many year 9 girls there are. For this example, lets say there's 120 year 9 girls and 1300 students in total.

    Then you'd substitute the numbers into the equation:

    120 (number in group) / 1300 (total population) x 50 (sample size)

    whatever you get you must round to the nearest whole number
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    (Original post by caitlinford3)
    It's a method of working out how many people of a particular characteristic (exam boards like the characteristic of same year group) would be in a random sample out of everyone.

    You work it out really easily by using the following formula:

    number of people in group / total population x sample size

    For example, a question may ask: how many year 9 girls will be in a sample of 50 students?

    After this, there will most likely be a table where you will be given or have to work out the total number of students by simply adding up, and then looking at how many year 9 girls there are. For this example, lets say there's 120 year 9 girls and 1300 students in total.

    Then you'd substitute the numbers into the equation:

    120 (number in group) / 1300 (total population) x 50 (sample size)

    whatever you get you must round to the nearest whole number
    ight thanks
 
 
 

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