Question

A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standard deviation were calculated. Based on the results, the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 4% of 70%.

Is the confidence interval at 90%, 95%, or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation.

Answer 1

@Photon336

Answer 2

@mathmale

Answer 3

@caozeyuan

Answer 4

9/10, so CL is 90%

Answer 5

that's the answer?

Answer 6

MOe is .04

Answer 7

MOE, sorry

Answer 8

CI is .66-.74

Answer 9

expalnation is just rephrase nine times out of ten, seniors will have an average score within 4% of 70%.

Answer 10

you cold say nine times out of ten, seniors will have an average score within 66%to 74%.

Answer 11

CL is confidence level, MOE is margin of error, CI is confidence interval, if you havent realized already

Answer 12

It is werid to see you working on estimation for stats, but just pre calc for pure

Answer 13

because by the time I reached estimation, I've done a year of calc