A First-Aid Cream Contains Amounts of the Active Ingredient (In

A first-aid cream contains amounts of the active ingredient (in milligrams) that vary Normally, with unknown mean μ and standard deviation σ from tube to tube. You select a simple random sample of 9 tubes and assess the quantity of active ingredient they contain. The 9 amounts, in milligrams, are
23 24 23 29 28 26 27 28 26
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Based on these data, how would we interpret a 99% confidence interval for the population mean μ?

A) We are 99% confident that the population mean quantity is between 23.5 and 28.5 mg.
B) We are 99% confident that the population mean quantity is between 24.08 and 27.92 mg.
C) We are 99% confident that the population mean quantity is between 23.58 and 28.42 mg.
D) We are 99% confident that the population mean quantity is between 25.25 and 26.75 mg.