Question

Use the formula to find the standard error of the distribution of differences in sample means, .

Samples of size  120 from Population 1 with mean  87 and standard deviation  14 and samples of size  85 from Population 2 with mean  71 and standard deviation  17

Round your answer for the standard error to two decimal places.

standard error =

Answer 1

Solution :

Given that,

1.

mean = = 87

standard deviation = = 14

n = 120

= 87

= / n = 14 / 120 = 1.28

2.

mean = =71

standard deviation = = 17

n = 85

= 71

= / n = 17 / 85 = 1.84