Questions from Applied Statistics


Q: Insurance companies are rated by several rating agencies. The Fitch 20

Insurance companies are rated by several rating agencies. The Fitch 20-point scale is AAA, AA+, AA, AA-, A+, A, A-, BBB+, BBB, BBB-, BB+, BB, BB-, B+, B, B-, CCC+, CCC, CCC-, DD. (a) What level of mea...

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Q: A tabletop survey by a restaurant asked the question shown below.

A tabletop survey by a restaurant asked the question shown below. (a) What kind of response scale is this? (b) Suggest an alternative response scale that would be more sensitive to differences in opin...

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Q: What level of measurement (nominal, ordinal, interval, ratio

What level of measurement (nominal, ordinal, interval, ratio) is appropriate for the movie rating system that you see in TV Guide (✰, ✰✰, ✰✰✰, ✰✰✰✰)? Explain your reasoning.

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Q: Historically, 5 percent of a mail-order firm’s repeat charge

Historically, 5 percent of a mail-order firm’s repeat charge-account customers have an incorrect current address in the firm’s computer database. (a) What is the probability that none of the next 12 r...

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Q: The weight of a miniature Tootsie Roll is normally distributed with a

The weight of a miniature Tootsie Roll is normally distributed with a mean of 3.30 grams and standard deviation of 0.13 gram. (a) Within what weight range will the middle 95 percent of all miniature T...

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Q: Suggest both a Likert scale question and a response scale to measure

Suggest both a Likert scale question and a response scale to measure the following: a. A student’s rating of a particular statistics professor. b. A voter’s satisfaction with the president’s economic...

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Q: Sarpedon Corp. claims that its car batteries average at least 880

Sarpedon Corp. claims that its car batteries average at least 880 CCA (cold-cranking amps). Tests on a sample of 9 batteries yield a mean of 871 CCA with a standard deviation of 15.6 CCA. (a) State th...

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Q: Thetis Mfg. says that its outboard watercraft engine’s noise level at

Thetis Mfg. says that its outboard watercraft engine’s noise level at 75 percent throttle averages 100 decibels or less from the operator’s seating position. A random sample of 8 noise level measureme...

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Q: Malcheon Health Clinic claims that the average waiting time for a patient

Malcheon Health Clinic claims that the average waiting time for a patient is 20 minutes or less. A random sample of 15 patients shows a mean wait time of 24.77 minutes with a standard deviation of 7.2...

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Q: A web-based company has a goal of processing 95 percent

A web-based company has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this prove that they are...

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