1. We read that the average weight for babies born in the United States is 7.5 pounds with
deviation of 0.25 pound. We can assume that birth weights are nearly normal. If we select one
baby at random, what are the chances that the baby weighs 8 or more pounds?
a.
Normal Model is appropriate with N(7.50, 0.25, X) and P(X > 8) = 0.0228
b.
Sampling Distribution Model is appropriate with N(7.50, 0.25/root(n), Ybar)
2. We read that the average weight for babies born in the United States is 7.5 pounds with
deviation of 0.25 pound. We can assume that birth weights are nearly normal. If we select a
random sample of five babies, what are the chances that the average of the 5 weights is 8 or
more pounds?
a.
Normal Model is appropriate. N(7.50, 0.25, X) and P(X > 8) = 0.0228
b.
Sampling Distribution Model is appropriate with N(7.50, 0.25/root(5), Ybar) and P(Ybar
>8) = 0
3. A survey was conducted to determine what percentage of college seniors would have chosen
to attend a different college if they knew what they know now. In a random sample of 100 seniors,
34 percent indicated that they would attend a different college. Determine a 90 percent
confidence interval for the percentage of seniors who would have attended a different college
a.
24.7% to 43.3%
b.
25.8% to 42.2%
c.
26.2% to 41.8%
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 Winter '08
 Ioudina
 Statistics, Normal Distribution, percent confidence interval

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