8. True or False (5 points, 1 point each)

a)If a system has two independent operations with standard deviations 3 and 4, then overall system standard deviation is 5.

b)In a normal distribution the area between 3 standard deviation on either side of mean is 99.73%

c)Distribution of sample variance is not an example of sampling distribution

d)Central limit theorem is dependent on sample size.

In the estimation theory, point estimate preferred as compared to interval estimate because it is easier to calculate and provides more information