Question: Sample size determination. Refer to Example 6.3 (page 293) to find the standard deviation of the delay departures for Delta Airlines is given by s

Sample size determination. Refer to Example 6.3 (page 293) to find the standard deviation of the delay departures for Delta Airlines is given by s 5 25.83.

(a) Use the sample size formula (page 311) to determine what sample size you need to have a margin of error equal to two minutes with 90% confidence. Explain why you must always round up to the next higher whole number when using the formula for n.

(b) What sample size do you need to have a margin of error equal to two minutes with 95% confidence?

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