Question

A manufacturer of pharmaceutical products analyzes a specimen from each batch of a product to verify the concentration of the active ingredient. The chemical analysis is not perfectly precise, but the company wants to know the true mean concentration. The laboratory analyzes each specimen 40 times and reports the sample mean concentration to be 0.8404 and the sample standard deviation was 0.0420.

1. Identify the parameter of interest.

2. What procedure should we use to construct this interval? (T or Z interval)

3. Using the interval you decided in part 2, determine the appropriate 95% CI using your calculator.

4. Interpret the interval in the context of this problem.

Answer 1