Question 211120
problems will make a particular brain area more active. 
To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percent signal change of 58. 
From many previous studies with this same math-problems procedure (but not listening to music), it is known that the signal change in this brain area is normally distributed with a mean of 35 and a standard deviation of 10. 
Using the .01 level, what should the researcher conclude?
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Ho: u = 35
Ha: u > 35
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Critical Value: z = 2.326
Test statistic: z = (35-58)/10 = 2.3
p-value = P(z>2.3) = 0.0107
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Since the p-value is greater than 1%, do not reject Ho
But the decision is very close. More testing should be done.
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Cheers,
Stan H.