Question

A population has a mean of 106 and a standard deviation of 21. A sample of 81 observations will be taken. The standard error of the sample mean (i.e., σx¯) is

Group of answer choices

21.00

2.33

9.00

0.26

Answer 1

Standard error = standard deviation / sqrt ( n)

= 21 / sqrt(81)

= 2.33