Given the information in Exercise 13.62 and data file XR13062, determine the 98% confidence interval for the
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In exercise
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 procedure 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.
A computer and statistical software.
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