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Suppose the coffee industry claimed that the average U.S. adult drinks 1.7 cups of coffee per day. To test this claim, a random sample of 34 adults was selected, and their average coffee consumption was found to be 1.95 cups per day. Assume the standard deviation of daily coffee consumption per day is 0.5 cups. Using a = 0.10, answer the following questions:
a) Is the coffee industry's claim supported by this sample?
b) Determine the p-value for this test.
c) Identify and interpret the critical sample mean or means for this problem.
d) Verify your results using PHStat2.
State the hypotheses that can be used to determine whether the population proportions of delayed departures differ at these two airports and what is the point estimate of the proportion of flights that have delayed departures atChicago O'Hare?
Find the probability that in a given year a) exactly one major hurricane will strike the U.S. mainland, b) at most one major hurricane will strike the U.S. mainland.
What assumptions must you make in order to use these statistics for inference? Explain in context what this confidence interval means.
a manuscript is sent to a typing firm consisting of typists a b and c. if it is typed by a then the number of errors
The Graduate Management Admission Council, who administers the test, claims that the mean total score is 529. Suppose a random sample of 8 students took the test, and their scores are given below. 699, 560, 414, 570, 521, 663, 727, 413 Use α = .05..
suppose a random sample of 100 u.s. companies taken in 2005 showed that 21 offered high-deductible health insurance
A mean life of 1800 hours and a standard deviation of 200 hours. Assume the life of these light bulbs follows a normal distribution. Find the probability that a single light bulb will have a life greater than 2000 hours.
The correlation between the returns on Ceramics Craftsman, Inc., and the returns on the S&P 500 is 0.675. The variance of the returns on Ceramics Craftsman, Inc., is 0.004225, and the variance of the returns on the S&P 500 is 0.001467.
Using the Binomial Distribution, find the probability that if Air Northeast books 21 people on a flight, not enough seats will be available for all booked passengers.
two electronic components of a missile system work in harmony for the success of the total system. let x and y denote
What is the null and alternative hypothesis? What is your final conclusion?
The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults, 48%of whom were men.
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