For a population withSolutionexpected value 80 standard er

. For a population with

Solution

expected value = 80

standard error =s/vn =20/sqrt(16) = 5

--------------------------------------------------------------------------------------------------------------------

In probability theory, the central limit theorem (CLT) states that, given certain conditions, the arithmetic mean of a sufficiently large number of iterates of independent random variables, each with a well-defined expected value and well-defined variance, will be approximately normally distributed

--------------------------------------------------------------------------------------------------------------------

sample mean=80

population mean=80

error =80-80=0