(Solved): For a certain drug, based on standards set by the United States Pharmacopeia (USP) - an official pub ...

For a certain drug, based on standards set by the United States Pharmacopeia (USP) - an official public standards-setting authority for all prescription and over-the-counter medicines and other health care products manufactured or sold in the United States, a standard deviation of capsule weights of less than 2 mg is acceptable. A sample of 18 capsules was taken and the weights are provided below:

99.8 99.6 101.6 100.5 100 98.7 100.1 100.1 102.1 99.3 100.8 99.6 98.4 101.2 100.4 99.3 99.6 98.3

The mean of the data set is 99.97; the sample standard deviation is 1.032; if the normality plot is not provided you may assume that the capsule weights are normally distributed.

Construct a 90% confidence interval for the variance (standard deviation) of all capsule weights.

1. Procedure: Select an answer One mean Z procedure One variance χ² procedure One proportion Z procedure One mean T procedure Correct
2. Assumptions: (select everything that applies)
   • Simple random sample
   • Population standard deviation is unknown
   • The number of positive and negative responses are both greater than 10
   • Population standard deviation is known
   • Normal population
   • Sample size is greater than 30

Partially correct

1. Unknown parameter: Select an answer σ², population variance μ, population mean p, population proportion Correct

Part 2 of 5

1. Point estimate: Select an answer sample mean, x̄ sample proportion, p̂ sample variance, s² = (Round the answer to 3 decimal places)
2. Confidence level % and �= , also
   • �2= , and 1-�2=
   • Critical values: (Round the answer to 3 decimal places)
     • left= right=