Are these statements True or False 1 Mean value over an inf

Are these statements True or False ?

1- Mean value over an infinite number of observations of the variables is the expected value of a random variables.

3- Data that are influenced by many small and unrelated random effects are approximately normally distributed.

4- A critical value is a z score separating unlikely values from those that are likely to occur.

5- It is 90% (or 0.90) confidence level for corresponding value of = 0.20

Solution

1 False (as expectation is defined in different way)

2 False (mean is 0 and varaince is 1)

3 False (they do not follow normal distribuition)

4 False critical value gives the regions of acceptance and rejection

5 False