Asked by Anonymous
A study of 40 psychology teachers showed that they spent, on average, 12.6 minutes correcting a student's final term paper. Find the 90 percent confidence interval of the mean time for all psychology teachers correcting final term papers when the deviation is 2.5.
Answers
Answered by
MathGuru
Formula:
CI90 = mean ± 1.645(s/√n)
mean = 12.6
s = 2.5
n = 40
Plug the values into the formula and calculate the interval.
CI90 = mean ± 1.645(s/√n)
mean = 12.6
s = 2.5
n = 40
Plug the values into the formula and calculate the interval.