Landings and takeoffs at Schiphol Holland per month are in
Landings and takeoffs at Schiphol, Holland, per month are (in 1,000s) as follows:
26, 19, 27, 30, 18, 17, 21, 28, 18, 26, 19, 20, 23, 18, 25, 29, 30, 26, 24, 22, 31, 18, 30, 19
Assume a random sample of months. Give a 95% confidence interval for the average monthly number of takeoffs and landings.
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