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.
AR
Related Maths A Level answers
All answers ▸A curve has equation y=x^2 + (3k - 4)x + 13 and a line has equation y = 2x + k, where k is constant. Show that the x-coordinate of any point of intersection of the line and curve satisfies the equation: x^2 + 3(k - 2)x + 13 - k = 0
How can I remember when a turning point of a function is a maximum or a minimum?
I've been told that I can't, in general, differentiate functions involving absolute values (e.g. f(x) = |x|). Why is that?
Find the stationary point of the curve y=3x^2-2x+2 and state the nature of this stationary point.