Suppose that we have collected a sample of 8 observations with values 12.6, 12.9, 13.4, 12.3, 13.6, 13.5, 12.6, and 13.1. What are the observed sample mean, observed sample variance, and observed sample standard deviation

The sample mean is 13.

The sample variance is 0.2286.

The sample standard deviation is 0.4781.

Step-by-step explanation:

The sample is:

S = {12.6, 12.9, 13.4, 12.3, 13.6, 13.5, 12.6, 13.1}

The sample is of size n = 8.

The formula to compute the sample mean, sample variance and sample standard deviation are:

Compute the sample mean as follows:

The sample mean is 13.

Compute the sample variance as follows:

The sample variance is 0.2286.

Compute the sample standard deviation as follows:

The sample standard deviation is 0.4781.

i do not know this sorry : (