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 ▸Points P and Q are situated at coordinates (5,2) and (-7,8) respectively. Find a) The coordinates of the midpoint M of the line PQ [2 marks] b) The equation of the normal of the line PQ passing through the midpoint M [3 marks]
Find the equation of the straight line that passes through the points (1,2) and (2,4)
How does the product rule for differentiation work
Find, w.r.t to x, both the derivative and integral of y=6*sqrt(x)