Question

For a sample of 4 operating rooms taken in a hospital study, the mean noise level was 41.4 decibels and the standard deviation was 10.3. Find the 95% confidence interval of the true mean of the noise levels in the operating rooms. Assume the variable is normally distributed. Round your answers to at least two decimal places.

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for sample of 29 operating rooms taken in a hospital
study,the mean noise level was 42.7 decibel,and the standard
deviation was 6.5.find the 98% confidence interval of the true mean
of noise level in the operating rooms.assum the variable is
normally distributed.use a graphical calculate and round the answer
to at least one decimal place.

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.

The ideal (daytime) noise-level for hospitals is 45
decibels with a standard deviation of 11 db; which is to say,
this may not be true. A simple random sample of 80
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 11 db. All answers to two places after the
decimal.
(a) A 99% confidence interval for the actual mean noise level...

A random sample of 18 registered nurses in a large hospital
showed that they worked on average 44.8 hours per week. The
standard deviation of the sample was 2.4. Estimate the mean of the
population with 95% confidence. Assume the variable is normally
distributed. Round intermediate answers to at least three decimal
places. Round your final answers to one decimal place.

a random sample of 45 days taken at a large hospital shows that
a mean of 37 patients were treated in the emergency room (ER) per
day. The standard deviation of the population is 4. Find the 95%
confidence interval of the mean number of ER patients treated each
day at the hospital. Express your answers as decimals to the
nearest hundredth , please show work and formulas used to solve
this , thanks so much!

A random sample of 14 observations is used to estimate the
population mean. The sample mean and the sample standard deviation
are calculated as 158.4 and 30.10, respectively. Assume that the
population is normally distributed. [You may find it useful
to reference the t table.]
a. Construct the 90% confidence interval for the
population mean. (Round intermediate calculations to at
least 4 decimal places. Round "t" value to 3 decimal
places and final answers to 2 decimal places.)
b. Construct...

Noise levels at 3 volcanoes were measured in decibels yielding
the following data:
142,113,135
Construct the 90%90% confidence interval for the mean noise
level at such locations. Assume the population is approximately
normal.
Copy Data
Step 2 of 4:
Calculate the sample standard deviation for the given sample
data. Round your answer to one decimal place

a) If a sample of SAT scores for 20 student has a score mean of
500 with a standard deviation of 48. What is the 99% Confidence
interval for the true mean? b) The birth weights in a population
are normally distributed with a standard deviation of 13 oz. If
sample of 25 was taken and its mean was 105, what is the 95%
Confidence interval lower bound for the true mean?

A random sample of 16 registered nurses in a large hospital
showed that they worked on average 44.3 hours per week. The
standard deviation of the sample was 2.3. Estimate the mean of the
population with 99% confidence. Assume the variable is normally
distributed. Round intermediate answers to at least three decimal
places. Round your final answers to one decimal place.

A random sample of 19 registered nurses in a large hospital
showed that they worked on average 44.6 hours per week. The
standard deviation of the sample was 2.1. Estimate the mean of the
population with 90%confidence. Assume the variable is normally
distributed. Round intermediate answers to at least three decimal
places. Round your final answers to one decimal place.

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