How do I calculate the proportions of sample means? (Psych-Elem. Stats)?
The homework problem is:
A population of scores forms a normal distribution with a mean of 80 and a standard deviation of 10.
a.) What proportion of the scores have values between 75 and 85?
b.) For samples of n = 16, what proportion of the samples will have means between 75 and 85?
c.) If the proportion of "a" and "b" are not equal, explain why the inequality.
I have answered question A by calculating the z scores and adding them together, but when it gets to B and C, I am not sure what the next step is when it turns to sample means.
Could someone offer some insight? I feel like I'm learning a new language in this class.
- Anonymous9 years ago