Count 11 Mean 48.3636 Median 45 StdDev 18.0846 StdErr 5.45273 IntQRange 25 25th %tile 35.5000 75th %tile 60.5000 4 20 60 Distance (ft) 2.
Paper airplanes In preparation for a regional paper
airplane competition, a student tried out her latest design.
The distances her plane traveled (in feet) in 11 trial
flights are given here. (The world record is an astounding
193.01 feet!) The data were 62, 52, 68, 23, 34, 45, 27, 42,
83, 56, and 40 feet. Here are some summaries:a) Construct a 95% confidence interval for the true
distance.
b) Based on your confidence interval, is it plausible that
the mean distance is 40 ft? Explain.
c) How would a 99% confidence interval for the
true distance differ from your answer in part a?
Explain briefly, without actually calculating a new
interval.d) How large a
get a confidence interval half as wide as the one you
got in part a, at the same confidence level?
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