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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