Posted by emily on Sunday, April 29, 2012 at 3:11pm.
if the null hypothesis is that the mean is 3218, the alternative hypothesis is that the mean > 3228, and the sample mean is x= 3342, the sample standard deviation is s=287, the sample size is n= 42, and α= 0.01
a. calculate the z test statistic.
b. what is the pvalue?
c. would this null hypothesis be rejected or not? justify answer with the pvalue.

statistics  PsyDAG, Monday, April 30, 2012 at 2:33pm
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n
If only one SD is provided, you can use just that to determine SEdiff.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
Answer This Question
Related Questions
 statistics  Given a sample size of 38, with sample mean 660.3 and sample ...
 STATS  Given a sample size of 18, with sample mean 660.3 and sample standard ...
 statistics  In performing a hypothesis test, the null hypothesis is population...
 Statistic  A random sample of size 20 drawn from a normal distribution has a ...
 STAT  Given a sample size of 18, with sample mean 660.3 and sample standard ...
 STAT  Given a sample size of 18, with sample mean 660.3 and sample standard ...
 Statistics  I have a question that involves explaining what is wrong in each of...
 Statistics  In an essay of 250500 words, thoroughly address the following ...
 Statistics  The null hypothesis,H0:u=48,was tested against the alternative ...
 statistics  A study is to be conducted to determine whether the mean cost of ...
More Related Questions