Find the estimated standard error for the sample mean for ea

Find the estimated standard error for the sample mean for each of the following samples. (Use 1 decimal place.)

n = 11 with SS = 1165

n = 31 with SS = 2405

n = 38 with SS = 1281

Solution

Given sum of squares is 1165 , 2405, 1281

And square root of these sum of squares is 34.1321, 49.0408, 35.7911 which is the standard deviations

The estimated standard error for the sample mean is
standard error = standard deviationdivided by the Sample mean

standard error= /n

standard error= 34.1321 /11 = 10.2912

standard error= 49.0408 /31 = 8.8080

standard error= 35.7911 /38 = 5.8061