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In an area having sandy soil, 50 small trees of a certain type were planted, and another 50 trees were planted in an area having clay soil. Let X = the number of trees planted in sandy soil that survive 1 year and Y = the number of trees planted in clay soil that survive 1 year. If the probability that a tree planted in sandy soil will survive 1 year is .7 and the probability of 1-year survival in clay soil is .6, compute an approximation to P(-5 X - Y 5) (do not bother with the continuity correction). and with the other parameter equal to a1 + a2. Is X + Y gamma distributed if the scale parameters are different? Explain.
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
a multiple-choice exam consists of 16 questions each with five alternatives. a student needs to answer at least 12 of
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
An electric utility wishes to examine the relationship between temperature and electricity use in its service region during the summer months.
The 90 percent confidence interval for the population mean is to (Round your answers to 3 decimal places.) Would it be reasonable to conclude that the population mean is 22 eggs? What about 24 eggs?
the probability that a call-centre consultant receives 3 calls during any given hour is 0.1404 and the probability
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
what are the assumptions necessary for hypothesis testing when using the method of least square in multiple regression?
1. a sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at 50 per share
The mean GMAT score of 65 applicants who were accepted into the MBA program of Xavier Business School was 520 with a standard deviation of 25. About how many applicants scored between 470 and 570 on the GMAT?
An investor wants to assess at confidence level of 98% if a medicament can improve the marks of students. He notices that for the following daily dozes: 2,2.5,3,4.5,7 mg, the improvement over the students that studied the same but took no mental b..
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