It is suspected that a supplier systematically underfills 5 l canisters of detergent. The filled volumes are assumed to be normally distributed. A small sample of canisters is measured exactly. This shows that the canisters contain on average ml. The sample variance is equal to .
Determine a confidence interval for the average content of a canister (in ml).
What is the lower confidence bound?
What is the upper confidence bound?
The confidence interval for the average content in ml is given by:
The lower confidence bound is .
The upper confidence bound is .