Dairy cows at large commercial farms often receive injections of bST (Bovine Somatotropin), a hormone used to
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Dairy cows at large commercial farms often receive injections of bST (Bovine Somatotropin), a hormone used to spur milk production. Bauman et al. (Journal of Dairy Science, 1989) reported that 12 cows given bST produced an average of 28.0 kg/d of milk. Assume that the standard deviation of milk production is 2.25 kg/d.
(a) Find a 99% confidence interval for the true mean milk production.
(b) If the farms want the confidence interval to be no wider than ±1.25 kg/d, what level of confidence would they need to use?
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Related Book For 
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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