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Cesar wants to know what the expected weight of a loaf of bread for quality control...

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Statistics

Cesar wants to know what the expected weight of a loaf of breadfor quality control purposes. Based on a sample of 14 loaves ofbread, he finds a sample average of 400 grams with a samplestandard deviation of 15 grams.

  • What’s the confidence interval at 95%?  What is it at99.9%?
  • What would the confidence intervals (for 95% and 99.9%) be ifthe sample average was based on 140 loaves instead of 14?

Answer & Explanation Solved by verified expert
4.1 Ratings (517 Votes)
a sample mean xbar 400 sample standard deviation s 15 sample size n 14 degrees of freedom df n 1 13 Given CI level is 95 hence 1 095 005 2 0052 0025 tc t2 df 216 ME tc ssqrtn ME 216 15sqrt14 ME 8659 CI xbar tc ssqrtn xbar tc ssqrtn    See Answer
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