Z- statistics? and how to calculate
We have a random sample of 200 something
with a sample average = 21
and standard deviation = 10
Can we say that the population average is greater then 14?
If we test with a signifance level = 0.01 then what value has the test statistics?
This is my thinking, because we have n>30, then we have to use the z - test?
I am calculating the value of test statistics for about 1 hour and still it's incorrect!
Re: Z- statistics? and how to calculate
Yes, the z-test can be used. Follow the examples in your textbook and class notes. If you need more help, please show all your work and say where you get stuck.
Originally Posted by Nforce