Questions from Business Statistics

Q: An airline offers discounted advance-purchase fares to customers who buy

An airline offers discounted advance-purchase fares to customers who buy tickets more than 30 days before travel and charges regular fares for tickets purchased during those last 30 days. The company...

Q: Return to the data on roller coasters seen in Exercise 23.

Return to the data on roller coasters seen in Exercise 23. Here is the distribution of the lengths of the rides of 241 coasters. We drew samples of 60 coasters from the full set of 241. We then repeat...

Q: Dan Diner employs three dishwashers. Al washes 40% of the

Dan Diner employs three dishwashers. Al washes 40% of the dishes and breaks only 1% of those he handles. Betty and Chuck each wash 30% of the dishes, and Betty breaks only 1% of hers, but Chuck breaks...

Q: A company manufacturing electronic components for home entertainment systems buys electrical connectors

A company manufacturing electronic components for home entertainment systems buys electrical connectors from three suppliers. The company prefers to use supplier A because only 1% of those connectors...

Q: In July 2005, the journal Annals of Internal Medicine published a

In July 2005, the journal Annals of Internal Medicine published a report on the reliability of HIV testing. Results of a large study suggested that among people with HIV, 99.7% of tests conducted were...

Q: Lie detectors are controversial instruments, barred from use as evidence in

Lie detectors are controversial instruments, barred from use as evidence in many courts. Nonetheless, many employers use lie detector screening as part of their hiring process in the hope that they ca...

Q: A certain company believes that 95% of its job applicants are

A certain company believes that 95% of its job applicants are trustworthy. The company gives everyone a polygraph test, asking, Have you ever stolen anything from your place of work? Naturally, all t...

Q: Find the expected value of each random variable: /

Find the expected value of each random variable:

Q: You draw a card from a deck. If you get a

You draw a card from a deck. If you get a red card, you win nothing. If you get a spade, you win $5. For any club, you win $10 plus an extra $20 for the ace of clubs. 1. Create a probability model for...

Q: You roll a die. If it comes up a 6,

You roll a die. If it comes up a 6, you win $100. If not, you get to roll again. If you get a 6 the second time, you win $50. If not, you lose. 1. Create probability model for the amount you win. 2. F...