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| Words: 3600 | Submitted: 16-Mar-2006 DescriptionExample of GCSE Maths statistics exercisePreview...To get a random sample of students I first need to decide how many students from each year and sex I will use. This is easy if I wish to collect for example a random sample of 30 year 7 boys and 30 year 7 girls because I already know how many students to pick at random and from which year and sex. However if I wish to take a random sample from the school as a whole, this is known as a stratified sample, I would need to work out how many males and females to take at random from each year using a formula. This is because different years have different amounts of students and different amounts of males and females within each year, so I need to make sure I take the same percentage of students from each sex in each year to make it a fair test. For example I may need 5% of all the boys in year 7 and 5% of all the girls in year 7 and 5% of all the boys in year 8 etc. but they should all be the same percentage to make it a fair test. To do this I divide the amount of students of one sex in a year group by the amount of students in the whole school and then multiply this by the amount of students needed to be chosen at random. A x C B A – Number of students of one sex in a single year group B – Number of students in the whole year C – Number of students to be chosen at random One example of this is when I did a pretest and required 30 boys and girls from the whole school, and so to do this I used the formula to work out how many students I would need from each year and each sex. Year 7 boys - 151 x 30 = 3.829247 1183 4 Boys Year 7 girls - 131 x 30 = 3.322062 1183 3 Girls Year 8 boys - 145 x 30 = 3.677092 1183 4 boys etc. ... Download this essay in full now!Just upload at one of your essays to our database and instantly download your selection! Registration takes secondsOr you can download this essay for $2 immediately without registeringComments and reviewsReviews are written by members who have downloaded the essay No comments yet. If you download the essay you can review it afterwards. |
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