Question

Noise levels at 3 volcanoes were measured in decibels yielding the following data:

149,163,157

Construct the 90% confidence interval for the mean noise level at such locations. Assume the population is approximately normal.

1. Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

2. Find the upper and lower endpoints

Answer #1

Noise levels at 3 volcanoes were measured in decibels yielding
the following data: 142,113,135 Construct the 90% confidence
interval for the mean noise level at such locations. Assume the
population is approximately normal. Step 3 of 4: Find the critical
value that should be used in constructing the confidence interval.
Round your answer to three decimal places

Noise levels at 5 volcanoes were measured in decibels yielding
the following data: 126,155,175,163,162 Construct the 98%
confidence interval for the mean noise level at such locations.
Assume the population is approximately normal. Step 3 of 4 : Find
the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.
Step 4 of 4: construct the 98% confidence interval.

Noise levels at 5 volcanoes were measured in decibels yielding
the following data:
108,133,140,129,136
Construct the 98% confidence interval for the mean noise level
at such locations. Assume the population is approximately
normal.
Step 3 of 4: Find the critical value that should be used in
constructing the confidence interval. Round your answer to three
decimal places.
Step 4 of 4: Construct the 98% confidence interval. Round your
answer to one decimal place.

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

Noise levels at 4 volcanoes were measured in decibels yielding
the following data: 153,156,168,138 Construct the 99% confidence
interval for the mean noise level at such locations. Assume the
population is approximately normal.
Step 1 of 4: Calculate the sample mean for the given sample
data. Round your answer to one decimal place.
Step 2 of 4: Calculate the sample standard deviation for the
given sample data. Round your answer to one decimal place.
Step 3 of 4: Find the...

Noise levels at 5 concerts were measured in decibels yielding
the following data: 142,142,123,133,139 Construct the 99%
confidence interval for the mean noise level at such locations.
Assume the population is approximately normal. Step 3 of 4 : Find
the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.

Noise levels at 7 manufacturing plants were measured in decibels
yielding the following data:
138,123,142,119,130,159,139
Construct the 80% confidence interval for the mean noise level
at such locations. Assume the population is approximately
normal.
Step 3 of 4 :
Find the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.

Noise levels at 5 airports were measured in decibels yielding
the following data:
154,104,155,124,116
Construct the 80% confidence interval for the mean noise level
at such locations. Assume the population is approximately
normal.
Step 3 of 4: Find the critical value that should be used in
constructing the confidence interval. Round your answer to three
decimal places.
step 4 of 4:Construct the 80% confidence interval. Round your
answer to one decimal place.

Noise levels at 3 airports were measured in decibels yielding
the following data: 158,140,147 Construct the 98% confidence
interval for the mean noise level at such locations. Assume the
population is approximately normal. Step 4 of 4 : Construct the 98%
confidence interval. Round your answer to one decimal place.

Noise levels at 6 airports were measured in decibels yielding
the following data:
157,164,160,147,152,153
Construct the 99% confidence interval for the mean noise level
at such locations. Assume the population is approximately
normal.
Copy Data
Step 4 of 4 :
Construct the 99% confidence interval. Round your answer to one
decimal place.

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