Question

The mean score on a biology exam taken by all undergraduate students in a college in a particular year is 67.8 with a standard deviation of 11.5. The standard error of the mean for a sample of 70 students is ______? And the margin of error of the mean is ____?

Answer 1

mean for 70 students is 1.37

Margin of error mean is 67.8 or -1.375

Explanation:

Answer 2

Standard error = standard deviation/sqrt(sample size) = 11.5/sqrt(70) = 1.375
Margin of error = 67.8 + or - 1.375