Question

What is the mean and standard deviation of the mean for the following set of data (3.9 2.6 4.3 2.2)

Answer 1

The sample size is n = 4 The provided sample data along with the data required to compute the sample mean and sample variance are shown in the table below:

	X	X2
	3.9	15.21
	2.6	6.76
	4.3	18.49
	2.2	4.84
Sum =	13	45.3

The sample mean is computed as follows:

Also, the sample variance is

Therefore, the sample standard deviation s is