Which statement is true a If we sample a normal population t

Which statement is true?

a) If we sample a normal population the sample skewness coefficient is exactly 0.

b) Business and economic data are rarely skewed to the right.

c) Outliers distort the mean but not the standard deviation.

d) With nominal data we can find the mode.

Solution

a) True as normal distribution, is symmetrical

b) False May or may not be skewed to the right

c) False Since mean changes as well as the varaince and hence standard deviation

d) False as nominal data can not be used to find the mode