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Chris M.
Chris M., M.S.W. Social Work
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Confidence Intervals, statistics & probability MULTIPLE CHOICE

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Confidence Intervals, statistics & probability MULTIPLE CHOICE question:

A random sample of 78 students was interviewed, and
59 students said that they would vote for Jennifer McNamara
as student body president.

(a) Let p represent the proportion of all students at this
college who will vote for Jennifer. Find a point
estimate for p.

(b) Find a 90% confidence interval for p.

(c) How many more students should be included in the
sample to be 90% sure that a point estimate will be within a distance of 0.05 from p?

Answer

Choice 1
(a) 0.756

(b) 0.68 to 0.84

(d) 122 more


Choice 2
(a) 0.856

(b) 0.68 to 0.84

(d) 122 more


Choice 3
(a) 0.756

(b) 0.68 to 0.80

(d) 122 more


Choice 4
(a) 0.756

(b) 0.68 to 0.84

(d) 112 more
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