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Question 351:



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  1. Use the confidence interval around a proportion calculator, select a 90% confidence interval and enter 86/773. You should get an interval of between 9.4% to 13.1% (the computational details are on the calculator page.
  2. Not sure how you check the normality assumption here since the data is a proportion based on the binomial, not normal distribution.
  3. Don't know what the Very Quick Rule is, never heard of that.
  4. Not sure what is atypical about this sample, other than over 10% of the kernels were not popped. The other thing to keep in mind is that you are making inferences about all pop-corn kernels based on just one-bag, experimentally it is more sound to sample multiple bags, the compute the confidence interval on the mean number of non-popped kernels.

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