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Movie rentals. To compete with Netflix, the owner of a movie rental shop decided to try sending DVDs through the mail. In order to determine how many copies of newly released titles he should purchase, he carefully observed turnaround times. Since nearly all of his customers were in his local community, he tested delivery times by sending DVDs to his friends. He found the mean delivery time was 1.3 days, with a standard deviation of 0.5 days. He also noted that the times were the same whether going to the customer or coming back to the shop.
a) Find the mean and standard deviation of the round-trip delivery times for a DVD (mailed to the customer and then mailed back to the shop).
b) The shop owner tries to process a DVD that is returned to him and get it back in the mail in one day, but circum- stances sometimes prevent it. His mean turnaround time is 1.1 days, with a standard deviation of 0.3 days. Find the mean and standard deviation of the turnaround times com- bined with the round-trip times in part a.
to test the significance of an individual regression coefficient we would conduct a and look for p-values smaller than
Canada has several small biotechnology companies which are research intensive and develop chemical compounds that may prove to be useful drugs, but they typically do not have the funding or global reach to test the compounds for government approva..
A sample of 64 Atlanta consumers showed a mean quarterly water bill of $51 with a sample standard deviation of $12. At α = .05, does the Atlanta sample support the conclusion that above-average rates exist for this private water system?
for each individual the probability that they will pass the proficiency exam independant of their classmates is .99.
in 2009 the number of feral quaker parrots living in austin was 250. in 1992 there were only 15 feral quaker parrots.
A random sample of n=9 men between 30-39 years old is asked to do as many sit ups as they can in one minute. The mean number is x=26.2 and the standard deviation is s=6. Find a 95% confidence interval for the population mean.
the number of deaths due to firearms in the united states between 1968 and 1993 are given belowyearfirearm deaths
Two groups were polled about their attitudes towards capital punishment. In one group 30 out of 100 favored capital punishment, and in the other group 40 out of 80 favored capital punishment. Calculate an appropriate test value to test the hypothesis..
What is the price of an extra dollar of c1 in terms of c2 and what is the equilibrium price? Output and profits of the low cost gold mine?
these instructions apply to all the problems.a draw thenbspscatter plotnbspfor the variables.b compute
If IQ scores on a Stanford-Binet Test are basically distributed with the mean of 100 and a standard deviation of 15, then about how many people in a randomly chosen million would be expected to score at 160 or above?
Find the probability that a) an individual graduate will have a salary over $45000 and b) A group of nine graduates will have a group average over $45000.
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