Question

The Hudson Valley Bakery makes doughnuts that are packaged in boxes. If the variation among the doughnuts is too large or too small, then the owner is in trouble because he may be losing profit (if they variation is too large) or cheating customers (if the variation is too small). The quality control supervisor has found that to stay out of trouble the boxes of doughnuts must have a mean of 3.50 oz and a standard deviation of 0.06 oz or LESS. Twelve doughnuts were randomly selected from the production line and weighed.3.43 3.37 3.58 3.50 3.68 3.61 3.42 3.52 3.66 3.50 3.36 3.42 a) Construct a 95% confidence interval of true standard deviation

Answer 1

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