Answer Key
Question 1
(Worth 2 points)
A newspaper conducted a statewide survey concerning the 1996 race for state senator. The newspaper took a
random sample of 1200 registered voters and found that 620 would vote for the Democratic candidate. Let p
represent the proportion of registered voters in the state that would vote for the Democratic candidate.
Using the above data, construct a 90% confidence interval for p
(.5, .528)
(.489, .545)
(.493, .5)
(.268, .766)
(.491, .543)
Points earned on this question
: 2
Question 2
(Worth 2 points)
The college newspaper of a large southwestern university periodically conducts a survey of students on the campus
to determine the attitude concerning issues of interest. Pictures were taken of the students interviewed along with a
quote of their responses are printed in the newspaper. Students are interviewed by a reporter "roaming" the campus
who selects students to interview "haphazardly." On a certain day the reporter interviews five students and asks them
if they feel there is adequate student parking on campus. Four of the students say "no."
Which of the following assumptions for inference about a proportion using a confidence interval are violated?
The population is at least 10 times as large as the sample
We are interested in inference about a proportion
There appears to be no outliers
There appears to be no violations
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 Spring '11
 BUCKLEY
 Normal Distribution

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