What is a confidence interval?
Using the normal distribution, we can estimate a range of values which we expect to contain the mean. For example, if we take a sample of 30 students height, we can estimate the mean height of students in the year group to lie within a certain range.
We can use different values of the normal distribution to change the accuracy of the confidence interval, for example either the 99% confidence interval or the 90% confidence interval. The greater the percentage confidence we use, the wider the interval will be.
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Related Maths A Level answers
All answers ▸What is differentiation?
Express root(125^x)/5^(2x-1) in terms of 5^a where a is an expression in terms of x.
Solve the pair of simultaneous equations; (1) y + 4x + 1 = 0, (2) y^2 + 5x^2 + 2x = 0 .
Find the total area enclosed between y = x^3 - x, the x axis and the lines x = 1 and x= -1 . (Why do i get 0 as an answer?)