# In May 2015, a poll asked a ra

In May 2015, a poll asked a random sample of 1,089 Americanadults the following question.

“Thinking about how the abortion issue might affect your votefor major offices, would you only vote for a candidate who sharesyour views on abortion or consider a candidate’s position onabortion as just one of many important factors or not see abortionas a major issue?”

It found that 21% of respondents said they will only vote for acandidate with the same views on abortion that they have. What isthe approximate margin of error for 95% confidence? (Round youranswer to two decimal places.)

——–%

Answer : In May 2015, a poll asked a random sample of 1,089American adults the following question. “Thinking about how theabortion issue might affect your vote for major offices, would youonly vote for a candidate who shares your views on abortion orconsider a candidate’s position on abortion as just one of manyimportant factors or not see abortion as a major issue?”

It found that 21% of respondents said they will only vote for acandidate with the same views on abortion that they have.

Solution :

Given, sample size, n = 1089,

sample proportion, p̂ = 21% = 0.21.

At, 95% confidence, α = 0.05

Hence, the critical value = Z_{α/2} = Z_{0.025} = 1.96.

Hence,

margin of error = Z(α/2)*√{p̂(1-p̂) / n}

= 1.96 * √{0.21(1 – 0.21)/1089}

=1.96 * √0.00015

= 1.96 * 0.01225

= 0.02401

= 2.40%

Therefore, the approximate margin of error for 95% confidence is2.40 %.

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