Question

A food snack manufacturer samples 13 bags of pretzels off the assembly line and weighs their contents. If the sample mean is xˉ and the sample standard deviation is s, what is the confidence interval of the true mean?

A.15.2<μ<16.2
B.15.5<μ<15.9
C.14.0<μ<17.4
D.12.3<μ<19.1

Answer 1

The 95 percent confidence interval for the true mean grams of fat per serving of chocolate chip cookies sold in supermarkets is (8.19, 9.81).

Step-by-step explanation:

A confidence interval is a range of values that is likely to contain the true population mean based on a sample. The 95 percent confidence interval means that if we were to repeat this sampling process many times, about 95 percent of the confidence intervals calculated would contain the true population mean. In this study, the confidence interval for the true mean grams of fat per serving of chocolate chip cookies sold in supermarkets is (8.19, 9.81).