Question 292053
The following hypotheses are given.
H0: p = 0.40
H1: p ≠ 0.40
A sample of 120 observations revealed that p = 0.30 At the 0.05 significance level, can the null hypothesis be rejected?
a. State the decision rule.
If z > 1.96 or less than -1.96, reject Ho.
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b. Compute the value of the test statistic.
z(0.30) = (0.30-0.40)/sqrt[0.4*0.6/120] = -2.2361
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c. What is your decision regarding the null hypothesis? 
Since the test stat is in the reject interval, reject Ho.
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Cheers,
Stan H.