Conduct a poll to discover the proportion

Reference no: EM137753

1. I read an article about a new drug which stated that "the incidence of side effects was similar to placebo, P-value > 0.05." I want to know if the results are significant at = 10%. With the information given,

A. I will reject the null hypothesis of no difference at 10%.
B. I will not reject the null hypothesis of no difference at 10%.
C. There is not enough information given.

2. I want to estimate the proportion of individuals in my area who think the public school system needs major overhauling. If I believe the proportion will be about 35%, how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%?

A. at least 30
B. at least 1068
C. at least 972

3. I want to conduct a poll to discover the proportion of individuals who believe that global warming is not going to be a problem. If I believe the proportion is about 80%, how many individuals will I need to sample to have a 90% confidence interval with a margin of error no more than 5%?

A. at least 174
B. at least 246
C. at least 271

Reference no: EM137753

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