The expected mean of a continuous population is 200, and its standard deviation is 15. A sample of 80 measurements gives a sample mean of 205. Using a 0.01 level of significance, a test is to be made to decide between “the population mean is 200” and “the population mean is different from 200.” State or find each of the following:
a. Ho
b. Ha
c. a
d. z(a/2)
e. µ (based on Ho)
f.  g. σ h. σ x
i. z, z-score for
j. decision
k. Sketch the standard normal curve and locate a/2, z(a/2), the critical region, and z.

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