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A sample of 100 healthy men was followed for the development of prostate cancer. After being followed for 5 years, 20 men of the study sample developed prostate cancer. Another 10 men of the sample were followed for 1 year and then were lost to follow up and we do not have information about their prostate cancer status. The remaining men who never developed the disease were followed for 10 years. Calculate the number of person-years of observation accrued by this population.
Using a significance level of 0.03, carry out a hypothesis test to determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
the data on the number of chocolate chips per bag for 42 bags of chips ahoy cookies were obtained by the students in an
many studies have found that people who drink alcohol in moderation have lower risk of heart attacks than either
A Gallup Poll used telephone interviews to collect data on consumer spending on different days of the week.25 Here are the averages
Calculate a confidence level at 95% to get an interval estimate for proportion?
Suppose that we survey 20 individuals working for a large company and ask each whether they favor implementation of a new policy regarding retirement funding. If, in our sample, 6 favored the new policy, find an estimate for p, the true but unkno..
Suppose 120 of the 150 homes surveyed use heating oil as the principal heating fuel. What is the probability of getting a sample proportion this large.
a local ice cream shop sells 10000 cones of vanilla-flavored ice cream each year. the cones are ordered from an outside
What is Gorman's optimal decision strategy? What is the probability that the market research report will be favorable? What is the expected value of the market research information? What is the efficiency of the information?
What is the probability that of 12 independent families, living on a certain street of that town, at least three will have lived there more than eight years?
suppose z is standard normal random variable. calculate the following possibilities.a.pzgt1.5b.p-0.33 ltz lt1.33c. pz
What is the numerical value of the sample proportion p^? Of what event is the P-value the probability?
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