1Mean value over an infinite number of observations of the v

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

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

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

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

Please check the answers if right and please explain by details the last one

Solution

1. TRUE
2. FALSE. They are related, but not equal.
3. TRUE.
4. TRUE.
5. FALSE. Note that alpha = 1 - c. So here, as alpha = 0.20, then c = 0.80.