Consider the following hypothesis test:

H0: p = .20

Ha: p .20

A sample of 400 provided a sample proportion p-bar = .175.

a. Compute the value of the test statistic (to 2 decimals).

b. What is the p-value (to 4 decimals)?

c. Using = .05, can you conclude that the population proportion is not equal to .20?

Answer the next three questions using the critical value approach.

d. Using = .05, what is the critical value for the test statistic? (+ or -)

e. State the rejection rule: Reject H0 if z is the lower critical value or the upper critical value.

f. Using = .05, can you conclude that the population proportion is not equal to .20?

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