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A cohort study of smoking and bladder cancer was conducted in a small island population. There were a total of 1000 people on the island. Four hundred were smokers and 600 were not. Fifty of the smokers developed bladder cancer. Ten of the non-smokers developed bladder cancer.
the weights of ripe watermelons grown at mr. smiths farm are normally distributed with a standard deviation of 2.7 lb.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
A single-elimination tournament with four players is to be held. In Game 1, the players seeded (rated) first and fourth play. In Game 2, the players seeded second and third play. In Game 3, the winners of Games 1 and 2 play, with the winner of Gam..
A sample of 25 concession stand purchases at the May 12 matinee of Spider-Man 3 showed a mean purchase of $ 7.29 with a standard deviation of $ 3.02. For the May 18 evening showing of the same movie.
a normal population has a mean of 60 and a standard deviation of 11. you select a random sample of 9. compute the
Consider strings of length 9 with elements being a, b or c. How many strings will contain at least 6 b a?
bob wishes to insure a priceless family heirloom against theft. the annual premium for policy a is 150 and it will pay
q1. consider a standard deck of cards that has 26 red cards and 26 black cards. find the probability of
A researcher is interested in knowing if there are differences between the incidence of accidents among male and female pilots. They were able to collect 62 responses from a random number of pilots. Among them, 17 male pilots were in accidents, 26 we..
a genetic experiment involving peas yielded one sample of offspring consisting of 426 green peas and 145 yellow peas.
A fair coin is tossed four times and X is number of heads on first three tosses and Y on last three. What is the joint probability mass function of x and y? What is the marginal pmf? Are X and Y independent?
Find the margin of error for this poll if we want 95% confidence in our estimate of the percent of American adults who approve of cloning humans.
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