The results are similar so it is understood that the calculations are correct.
MATHS ASSIGNMENT
TASK 1
STATISTICAL INVESTIGATION
hypothesis
I am hoping to find that boys are taller than girls.
Plan
I will ensure that my plan and chosen sampling method is satisfactory wth my maths tutor. I will collect a fair sample of 20 boys and 20 girls. In order for the sample to be unbiased, I will use random sampling to generate random numbers from 1 to 200. I will not use the same child twice, nor with incomplete data. I will then use the sample to calculate the average height of boys and girls to test my hypothesis.
Sampling method – random sampling
I wll use a calculator to generate random numbers by doing the following: press shift Ran # to generate a number.
Press = to continually obtain further random numbers.
Numbers from 1-200 are required, so I will use the following: Press shift Ran # multiplied by 200.
I will then round each number up or down accordinally to produce a whole number.
That is then the number of the child whose data I will highlight and use.
Calculations by being able to find the average height of boys and girls I am able to find 1 figure that represents the boys and 1 figure that represents the girls. By doing this it will allow me to compare the heights effectively.
The method I will use to find the average (mean) height of both boys and girls is:
mean for boys = total number of heights (boys) number of boys = cm to 1 decimal place
mean for girls = total number of heights (girls) number of girls = cm to 1 decimal place
in order to check that I have the correct methods of calculations I will use another type of average to check the mean calculations. Median is the middle value when all of the heights are arranged in order of sze. The mean and median averages are similar so I will assume that my calcualtions are correct.
For example if the middle numbers are 151 and 152 then the formula used is:
151 / 152 = median = 151 + 152
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