Question

The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 10 db. A simple random sample of 500 hospitals at a moment during the day gives a mean noise level of 46 db. Assume that the standard deviation of noise level is really 10 db.

Part One.

Assuming that the average noise level of hospitals is what it's
supposed to be, what is the probability of a sample of 500
hospitals producing an average as high as our sample's (p-value)?
(_)

Which comes from a test-statistic of z= (_) (Without Sign)

Part Two:

Assuming that the average noise level of hospitals is what it's
supposed to be, what is the probability of a sample of this many
hospitals producing an average as far from the truth as is our
sample's (p-value)? (_)

Answer #1

Part one: Here test will be one tailed.

Part 2:

----------------------------------------------------------------------

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db. Assume that the standard deviation of noise level for all
hospitals is really 12 db. All answers to two places after the
decimal.
(a) A 99% confidence interval for the actual mean noise level...

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db. Assume that the standard deviation of noise level for all
hospitals is really 11 db. All answers to two places after the
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The average teacher salary in Nebraska is $52,925 with a
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