Just B on preliminary and ABC on testing the claim

A myopenmath.com From previous studies, it is concluded that 30% of people support legalizing gay marriage. A researcher claims it has decreased and decides to survey 100 adults. Test the researcher's claim at the a = 0.05 significance level. Preliminary: a. Is it safe to assume that n 10. Round your answer to one decimal place. np(1 - p) = Test the claim: a. Express the null and alternative hypotheses in symbolic form for this claim. Ho : ? V ? Ha : ? V ? b. After surveying 100 adult Americans, the researcher finds that 86 people support legalizing gay marriage. Compute the test statistic. Round to two decimal places. Z c. What is the p-value? Round to 4 decimals. P = d. Make a decision based on a = 0.05 significance level