Question

3) The XYZ company is concerned about the safety record of the firm’s employees and sets
aside 30k a year for their safety education. The finance VP was also interested in how much
money was set aside by similar companies. To estimate that amount, a sample 36 similar
companies were studied. Results were x̅ = 29500 and S = 2000.

a - build to 90% confidence interval for money set aside by similar companies.
b - is XYZ setting aside an unusual amount of money or same as others?

4) Assume that 90% of an airline flights arrive on time. Tomorrow that airline has 400 flights
scheduled to arrive.

a - What is the probability that between 353 and 365 of those 400 flights will be on time?

Answer 1

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