Question

Noise levels at 5 construction sites were measured in decibels yielding the following data:

179,166,143,183,146,

Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal.

Step 2 of 4:

Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place

Answer #1

Using Excel we get,

sample mean = **163.4**

sample standard deviation = **18.4**

Degrees of freedom = 5 - 1 = **4**

t-critical value at significance level of 0.01 with 4 degrees of freedom is,

Excel Command : =TINV(0.01, 4) = 4.604

Margin of error (E) is,

The 99% confidence interval for the population mean is,

Therefore, the 99% confidence interval for the mean noise level
at such locations is **(125.51, 201.29).**

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 1 of 4 :
Calculate the sample mean for the given sample data. Round your
answer to one decimal place.

Noise levels at 5 airports were measured in decibels yielding
the following data:
152,154,139,124,120
Construct the 80% 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.

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 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.

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 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 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 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 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.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 31 minutes ago

asked 48 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago