A food snack manufacturer samples 9 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 9.6 and the sample standard deviation is 0.20, find the 95% confidence interval of the

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Quizplus · Accepted Answer

We can use the formula: 
CI = x̄ ± z*(σ/√n)
where x̄ = sample mean, σ = sample standard deviation, n = sample size, and z = the critical value for the desired confidence level (95%).
Using a table or calculator, we find that the z-value for a 95% confidence level is approximately 1.96.
Plugging in the values, we get:
CI = 9.6 ± 1.96*(0.20/√9)
CI = 9.6 ± 0.16
CI = (9.44, 9.76)
Therefore, the best choice is D, which is closest to our calculated confidence interval.

A Food Snack Manufacturer Samples 9 Bags of Pretzels Off