Questions from Statistics Principles

Q: In one 45-day period, American Airlines flew 152 flights

In one 45-day period, American Airlines flew 152 flights from Chicago, Illinois, to Austin, Texas. Of these, 22 arrived late. Treat this as a random sample and conduct a test with the intent of establ...

Q: Each year, an insurance company reviews its claim experience in order

Each year, an insurance company reviews its claim experience in order to set future rates. Regarding their damage-only automobile insurance policies, at least one claim was made on 2073 of the 12,299...

Q: Upon examination of the claims records of 280 policy holders over a

Upon examination of the claims records of 280 policy holders over a period of five years, an insurance company makes an empirical determination of the probability distribution of X = number of claims...

Q: A genetic model suggests that 80% of the plants grown from

A genetic model suggests that 80% of the plants grown from a cross between two given strains of seeds will be of the dwarf variety. After breeding 200 of these plants, 136 were observed to be of the d...

Q: Refer to Exercise 8.2 where participants wore a counting device

Refer to Exercise 8.2 where participants wore a counting device for a week, and each day they counted the number of times they thought about food. The average of the seven daily counts, for each of n...

Q: Consider the problem of testing H0: µ = 10 versus H1

Consider the problem of testing H0: µ = 10 versus H1 :µ > 10 with n = 64, u = 2 (known), and a = .025 . The rejection region of this test is given by Suppose we wish to ca...

Q: Refer to the data on the computer attitude score (CAS)

Refer to the data on the computer attitude score (CAS) in the Data Bank. A computer summary of a level a = .05 test of H0 : µ = 2.6 versus a two-sided alternative and a 95% confidence int...

Q: Refer to the data on percent malt extract in the Data Bank

Refer to the data on percent malt extract in the Data Bank. A computer summary of a level a = .05 test of H0 : µ = 77 versus a two-sided alternative and a 95% confidence interval is given...

Q: Refer to the data on the heights of red pine seedlings in

Refer to the data on the heights of red pine seedlings in Exercise 8.3. Use MINITAB to: (a) Find a 97% percent confidence interval for the mean height. (b) Test H0 : µ = 1.9 versus H1 :...

Q: In a study of head injuries to ice hockey players the number

In a study of head injuries to ice hockey players the number of hits were monitored electronically by equipping approved helmets with accelerometers that measured head acceleration (m/s2) when a playe...