There is always a need for people to donate blood. College s…
There is always a need for people to donate blood. College students often volunteer when there are blood drives on campus. A survey is conducted to determine the percentage of students who have a negative blood type (O-, A-, B- or AB-) as they exit the bloodmobile. The 95% confidence interval for the percentage of students who reported a negative blood type is (12.4%, 17.7%). Complete parts a and b. a.) Interpret the meaning of this confidence interval using a complete sentence. b.) What would be the sample size required to estimate the percentage of students who reported a negative blood type? Assume no prior studies were made and we need to be within an error of 3%.
Read DetailsThe following data describe a survey of 150 registered voter…
The following data describe a survey of 150 registered voters in order to study the relationship between party affiliation and support for certain bill. Answer parts a, b and c, round all answers to three decimals. For Against No Opinion TOTAL Democrat 37 16 5 58 Republican 13 34 7 54 Independent 7 11 20 38 TOTAL 57 61 32 150 a.) What is the probability a registered voter is Democrat or is For the bill? [a] b.) What is the probability that a registered voter is against the bill given they are Republican? [b] c.) What is the probability that if two registered voters are selected without replacement, they are both For the bill? [c]
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