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A large school system is planning a renovation of a number of schools, all built prior to 1940. While making estimates for the budget, it was necessary to forecast the likely cost of renovation based on accumulated experience in past similar jobs. The cost data on old jobs has been updated to current conditions using the Engineering News-Record index. Data are as follows:
(a) Assume that the expected cost of renovation is linear with the number of rooms. Estimate the regression line and show the relationship on a plot with the data. Estimate σ and plot lines 1 standard deviation each side of the mean value function. Estimate and plot 1-standard-deviation confidence limits on the mean value.
(b) If the first job to be studied contains 32 rooms, use the results of (a) to make statements about its
expected cost and the standard deviation of this figure. Note that a single forecast of the random variable, i.e., cost, is desired.
(c) Data on the number of stories are given. Repeat the analysis using number of stories to predict the cost. The job contains three stories. Which independent variable-number of rooms or number of stories- gives a "more reliable" prediction of cost?
The three accompanying quotes are all from the San Luis Obispo Tribune, but each gives a different interpretation of the median price of a home
q1. according to a study several years ago the average bmw driver earns 82 600 per year. suppose a researcher believes
how easy is it to get into contact with a person in sacramento california? if you dont know the telephone number it
Net sales of the Kaiser Aluminum and Chemical Corporation for the period beginning in 1975 and ending in 1984 were:
The n =10 patients had a mean decrease in IOP of = 15.2 mm Hg with a standard deviation of the 10 IOPs equal to s = 9.8 mm Hg after 15 weeks of using the drug. Determine the appropriate sample size for an a α = .01 test to have at most a .10 pr..
Find the probabilities that in 1 hour (a) there are between 23 and 26 calls inclusive, (b) more than 30 calls, using the normal approximation to the poisson distribution.
In multi-choice test, each question has four options. Students wil get 10 points for each correct answer; lose four points for each incorrect answer; and receive no points for unanswered questions.
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
Ten wireless customers are chosen. Under what conditions is the number of Verizon customers a binomial random variable?
A unity feedback closed-loop system has a steady state error equal to .4/10, where the input is r(t) = At2/2. The Bode plot of the magnitude and phase angle versus co is shown in Figure P8.25 for G(jω). Determine the transfer function G(s).
A security system has been set up so that if three incorrect passwords are tried before the correct one, the computer file is locked and access to it denied. If n = 7, what is the probability that the secretary will gain access to the file?
Give two transformations that are suitable transformations to try that might achieve a distribution somewhat closer to a normal distribution for the number of tablets per bottle that are outside the stated limit.
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