Question 177923
1- You want to prove that a population mean is not 7. Data is ratio and a large sample size will be used (n = 225). When the sample is done the sample mean is computed to be 7.2 and the sample standard deviation is 1.5. Test the hypothesis using an alpha of 5%. Use formal hypothesis testing and compute the p-value. 
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Ho: u = 7
Ha: u is not equal to 7
Critical value for 2-tail test and alpha = 5%: +/-1.96
Test Statistic: z(7.2) = (7.2-7)/[1.5/sqrt(225)] = 2
p-value = 2*P(z>2) = 2*0.02275.. = 0.0455..
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Conclusion: Sinde the p-value is less than 5%, reject Ho.
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P.S. I assume you were able to figure out #2.
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Cheers,
Stan H.
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Comment on your #2:
To see an analysis of EXCEL ANOVA output use Google 
with that search string.
Or just go to:
http://org.elon.edu/econ/sac/anova.htm

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Cheers,
Stan H.