Question

The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 10 db; which is to say, this may not be true. A simple random sample of 70 hospitals at a moment during the day gives a mean noise level of 47 db. Assume that the standard deviation of noise level for all hospitals is really 10 db. All answers to two places after the decimal.(e) Assuming our sample of hospitals is among the most typical half of such samples, the actual mean noise level in hospitals is between WebAssign will check your answer for the correct number of significant figures. Incorrect: Your answer is incorrect. db and WebAssign will check your answer for the correct number of significant figures. Incorrect: Your answer is incorrect. db. (f) We are 95% confident that the actual mean noise level in hospitals is Incorrect: Your answer is incorrect. db, with a margin of error of Web Assign will check your answer for the correct number of significant figures. Incorrect: Your answer is incorrect. db. (g) How many hospitals must we examine to have 95% confidence that we have the margin of error to within 1 db? Incorrect: Your answer is incorrect. (h) How many hospitals must we examine to have 99.9% confidence that we have the margin of error to within 1 db? Incorrect: Your answer is incorrect.

Answer 1