The sodium content (in milligrams) of organic cornflakes from 20 cereal boxes has mean 129.747 and standard deviation 0.87643. Consider this a “pilot” study and use the standard deviation from the study as your best guess for σ to do the following in order to plan for a future experiment. Use the methods described in the notes. Determine the sample size (number of boxes) required such that a 98% confidence interval will estimate the true mean sodium content to within 0.25 milligrams.

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