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According to a study by the American Pet Food Dealers Association, 67 percent of U.S. households own pets. A report is being prepared for an editorial in the San Francisco Chronicle. As a part of the editorial a random sample of 310 households showed 230 own pets. Does this data disagree with the Pet Food Dealers Association data? Use a 0.10 level of significance.
State the decision rule for 0.10 significance level.
Compute the value of the test statistic.
master card and other credit card issuers must by law print the annual percentage rate apr on their monthly statements.
A manufacturer of athletic footwear claims that the mean useful lifetime of his product will exceed 50 hours. A random sample of 36 pairs of shoes leads to the following sample results, in terms of useful life: x = 52.3 hours and s = 9.6 hours.
question suppose that new international students arrive in london according to a poisson process of rate lambda 2 per
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
for a particular instant lottery the bettor can determine immediately whether a purchased ticket is a winning ticket.
Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
what proportion of the data from a normal distribution is two standard deviations from the mean?1. 0.47722. 0.34133.
a random sample of 33 adult men had a mean weight of 182.5 pounds and a standard deviation of 22.5 pounds. find a 99
Rachel's doctor suspects she is suffering from hypoglycaemia. The amount of glucose in the bloodstream varies and a person with hypoglycaemia has an average blood glucose level of less than 65 mg/dL.
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
A contractor is considering a sale that promises a profit of $34,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $16,000 with a probability of 0.3. What is the expected profit?
what is the relationship between the confidence level and type i
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