Question: Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86. (a) Construct a 90 percent confidence interval for the proportion

of all kernels that would not pop. (b) Check the normality assumption. (c) Try the

Very Quick Rule . Does it work well here? Why, or why not? (d) Why might this sample not be typical?

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