Question

A health inspector was interested in determining if the noise levels of hospital

corridors in an urban area is greater than 59 decibels. To test this, the noise levels at

84 randomly chosen hospitals from the urban area were measured in decibels. The

sample mean noise level was 61.2 decibels, and the population standard deviation is

7.9 decibels. Use the five step method to test the inspectors claim using α = .025.

Answer #1

To Test :-

H0 :-

H1 :-

Test Statistic :-

Z = 2.5523 2.55

Test Criteria :-

Reject null hypothesis if

Result :- Reject null hypothesis

There is sufficient evidence to support the claim that the noise levels of hospital corridors in an urban area is greater than 59 decibels.

A health inspector was interested in determining if the mean
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To test this, the noise levels at 64 randomly chosen road
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is 10 decibels. Use the five step testing method using α = .025 to
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A researcher claims the mean noise levels at road construction
sites in Minnesota are greater than the mean noise levels at road
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had a mean noise level of 82 decibels with a standard deviation of
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Question 21
Suppose a health insurance company is interested in carrying out
an investigation as to the annual expenditures per household on
their healthcare costs. In order to most accurately report their
figures, the company decides to ensure “virtual certainty” about
their estimates by using a Z value of 3.0 for their calculations.
The company conducts a SRS of 843 households and determines the
sample average household expenditures on healthcare is
$43,257.00.
A) Assume the company uses a σ=$879.00. Calculate...

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