One of the subjects, Racheal, has x = 60 and y = 52. (a) Calculate Racheal's predicted value, ŷ. (b) Calculate Racheal's residual.
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- The management of a large national chain of 20 motels, each with 100 rooms, decided to estimate the mean cost per room of repairing damages made by its customers . A random sample of 31 vacated rooms was inspected by the management and indicated a mean repair cost Of tilde x =\$28.10 and a sample standard deviation of s=\$12.40 . Construct a 95\% confidence interval for the mean repair cost u for the 2000 motel rooms .Suppose that 5000 students who have taken the SAT exam once are randomly assigned to either take an SAT coaching course or not, with the following results in their improvements in SAT scores when they take the exam a second time: Coaching Group Control Group Sample Sample Size Sample Mean Standard Deviation 2500 2500 46.2 44.4 12.3 5.5 Create and interpret a 90% confidence interval for the parameter of interest.