Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.025) and its Z score. Insert Z score and other data into equation below.
95% = mean ± Z(SD)
A sample of fifteen 2-liter bottles of a soft drink delivers a mean weight of 2009 milliliters with a sample standard deviation of 11 milliliters. The quality assurance department wants to determine if there is a true fill problem, so they determine the confidence interval at 95% confidence to be ________.
2 answers
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