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 ▸(https://qualifications.pearson.com/content/dam/pdf/A-Level/Mathematics/2013/Exam-materials/6666_01_que_20160624.pdf) Question 6.(i)
A girl kicks a ball at a horizontal speed of 15ms^1 off of a ledge 20m above the ground. What is the horizontal displacement of the ball when it hits the ground?
How do I do definite integrals?
Express cos(x) + (1/2)sin(x) in terms of a single resultant sinusoidal wave of the form Rsin(x+a)