This might help:
http://davidmlane.com/hyperstat/z_table.html
A random sample of size n = 72 is taken from a finite population of size N = 644 with mean μ = 239 and variance σ2 = 325. Use Table 1.
a-1.
Is it necessary to apply the finite population correction factor?
Yes
No
a-2.
Calculate the expected value and the standard error of the sample mean. (Do not round intermediate calculations. Round "standard error" to 3 decimal places.)
Expected value
Standard error
b.
What is the probability that the sample mean is less than 229?
Probability
c.
What is the probability that the sample mean lies between 234 and 249? (Use rounded standard deviation. Round "z" value to 2 decimal places and final answer to 4 decimal places.)
Probability
2 answers
Have no idea of contents of Table 1.
1. No
2a. SEm = SD/√n = (√variance)/n
2b. Z = (score-mean)/SEm
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
2c. Use same equation and Table.
1. No
2a. SEm = SD/√n = (√variance)/n
2b. Z = (score-mean)/SEm
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
2c. Use same equation and Table.
1 answer