## Description

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 81 hospitals at a moment during the day gives a mean noise level of 47 db. Assume that the standard deviation of noise level is really 10 db. All answers to two places after the decimal.

1. Assuming our sample of hospitals is among the most typical half of such samples, the actual mean noise level in hospitals is between _____ db and _____ db.

## Explanation & Answer

Please find answer.Thank you.

Last Name 1

Name

Course

Nov 13,2017

Normal Distribution

Answer

Fig 1.Image Retrieved from onlinestatbook.com.

Standard deviation of the sample = 10...

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