Posted by **Cheri** on Wednesday, December 27, 2006 at 7:25pm.

Is a sampling distribution always the same as the curve for a null hypothesis?

How does the power of a z test change when sigma increases?

Assuming that they are caused solely by chance, sampling distributions will approximate a normal distribution more closely as the size of the sample increases. However, with small samples, there may be great differences.

I don't understand your second question. Sigma in a formula is used just to indicate that you add the terms that follow that symbol.

I hope this helps. If not, repost your new questions. Thanks for asking.

## Answer this Question

## Related Questions

- Statistics - Trying to finish an assignment: What happens to the power of the z ...
- Statistics - A statistical test is performed, and its P-value turns out to be ...
- Stats - A statistical test is performed, and its P-value turns out to be about 3...
- Statistics - What does it mean when a researcher chooses the cutoff in a ...
- Statistics - are the following statements, Ho:=10 and Ha:equal to or less than, ...
- statistics - Which of the following statements are false? (A) The t-...
- statistics - Use the given information to find the P-value. Also, use a 0.05 ...
- statistics - In a chi-squared test of a contingency table, the value of the test...
- STATS - Given a sample size of 18, with sample mean 660.3 and sample standard ...
- Math (Statistic) - Considered the sampling distribution of a sample mean ...