SOLUTION: A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 13.7 oz. and the sample standard deviation is 0.40 oz.,
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Question 1041537: A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 13.7 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
A. 13.3 < μ < 14.1
B. 13.5 < μ < 13.9
C. 11.7 < μ < 15.7
D. 12.8 <μ < 14.6
You can put this solution on YOUR website! Here, a t-test has to be used.
the SE is t(0.975,df=6)*s/sqrt(n)
That is 2.4469*0.4/sqrt(7)
This is 0.3699 or 0.37
(13.33,14.07)
A is the best choice.
