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In past studies, a fast-food franchise has found the standard deviation of weights for quarter-pound hamburgers to be approximately 0.28 ounces after cooking. A consultant has suggested a new proce- dure for hamburger preparation and cooking that she believes will reduce the variability in the cooked weight of the hamburgers. In a test of the new method, 61 hamburgers are prepared, cooked, and weighed, with the resulting cooked weights listed in data file XR13062. At the 0.05 level, and assuming a normal distribution for the weights, examine the possibility that the new procedure is actually no better than the old one.
Sketch curves representing the distribution of the original population and the sampling distribution of x for a sample of size n+16.
What other attributes are important in a job decision? Would the two-attribute utility function you just assessed be useful as a first approximation if many of the other at- tributes were close in comparing two jobs?
the influence of running on preventing heart attacks has been studied by a local runners club. the following twoshyway
the times in minutes to assemble a computer component for 3 different machines are listed in the table below. workers
A basketball player shoots 8 free throws during a game. If we assume that each attempt has the same probability of success, the sample space for the number of baskets he/she makes during the game is ??
Problem 1: Consider the natural cubic spline function s(x) interpolation the following data:
Distribution of Sample Means
Consider the following joint frequency table which summarizes voting trends in the most recent Presidential election.
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
Quarterly customer surveys are taken at a medical center. Each individual department has scores and is comparted to the medical center average. Department of Physical Therapy had scores of 9.14, 9.19 and 7.75 for quarters 1-3 respectively.
(a) Find the 95% confidence interval for the average monthly comprehensive car insurance premium paid by all owners of medium-sized cars. Interpret the result. (Use the z-table.) (b) Find the 90% confidence interval for the same problem. Interpret ..
If individual luggage weights are independent, normally distributed rv's, what is the probability that total luggage weight is at most 2500 lb?
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