Question

Use the given degree of confidence and sample data to construct a confidence interval for the population mean µ.

39 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 21.1 pounds and a standard deviation of 3.7 pounds. What is the 95 percent confidence interval for the true mean weight, µ, of all packages received by the parcel service?

Group of answer choices

(19.7, 22.5)

(19.9, 22.3)

(19.6, 22.6)

(20.1, 22.1)

Answer 1

Confidence interval calculation .

Lower bound = 19.9

upper bound = 22.3