Question

A geologist examines 6 seawater samples for lead concentration. The mean lead concentration for the sample data is 0.903 cc/cubic meter with a standard deviation of 0.0566. Determine the 95% confidence interval for the population mean lead concentration. Assume the population is approximately normal.

Step 1 of 2 :

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

Answer #1

Refer t-table or use excel function "=T.INV.2T(0.05,5)" to find the value of t.

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A geologist examines 18 water samples for iron concentration.
The mean iron concentration for the sample data is 0.272 cc/cubic
meter with a standard deviation of 0.08510 Determine the 99%
confidence interval for the population mean iron concentration.
Assume the population is approximately normal.
Step 1 of 2: Find the critical value that should be used in
constructing the confidence interval. Round your answer to three
decimal places.
Step 2 of 2: Construct the 99% confidence interval. Round your
answer...

A physicist examines 44 water samples for mercury concentration.
The mean mercury concentration for the sample data is 0.4700.470
cc/cubic meter with a standard deviation of 0.05810.0581. Determine
the 80%80% confidence interval for the population mean mercury
concentration. Assume the population is approximately normal.
Step 1 of 2:
Find the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.
Step 2 of 2:
Construct the 80%80% confidence interval. Round your answer...

A researcher examines 4 sedimentary samples for mercury
concentration. The mean mercury concentration for the sample data
is 0.621 cc/cubic meter with a standard deviation of 0.0128.
Construct the 80 % confidence interval for the population mean
mercury concentration. Assume the population is approximately
normal.
Lower endpoint:
Upper endpoint:

In a random sample of 11 11 residents of the state of Florida,
the mean waste recycled per person per day was 1.1 1.1 pounds with
a standard deviation of 0.21 0.21 pounds. Determine the 95% 95 %
confidence interval for the mean waste recycled per person per day
for the population of Florida. Assume the population is
approximately normal. Step 1 of 2 : Find the critical value that
should be used in constructing the confidence interval. Round your...

A manager records the repair cost for 14 randomly selected
dryers. A sample mean of $88.34 and standard deviation of $19.22
are subsequently computed. Determine the 90% confidence interval
for the mean repair cost for the dryers. Assume the population is
approximately normal. Step 1 of 2: Find the critical value that
should be used in constructing the confidence interval. Round your
answer to three decimal places.

In a random sample of 9 residents of the state of New York, the
mean waste recycled per person per day was 2.1 pounds with a
standard deviation of 0.25 pounds. Determine the 90% confidence
interval for the mean waste recycled per person per day for the
population of New York. Assume the population is approximately
normal.
Step 1 of 2:
Find the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal...

In a random sample of 7 residents of the state of Maine, the
mean waste recycled per person per day was 1.7 pounds with a
standard deviation of 0.71 pounds. Determine the 90% confidence
interval for the mean waste recycled per person per day for the
population of Maine. Assume the population is approximately normal.
Step 1 of 2: Find the critical value that should be used in
constructing the confidence interval. Round your answer to three
decimal places. Also,...

A consumer affairs investigator records the repair cost for 44
randomly selected TVs. A sample mean of $54.41 and standard
deviation of $28.89 are subsequently computed. Determine the 90%
confidence interval for the mean repair cost for the TVs. Assume
the population is approximately normal.
Step 1 of 2:
Find the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.
Step 2 of 2:
Construct the 90% confidence interval. Round your...

Given two dependent random samples with the following
results:
Population 1 45 46 27 36 38 33 15
Population 2 42 32 42 41 25 28 19
Use this data to find the 95% confidence interval for the true
difference between the population means. Let d = (Population 1
entry -- (Population 2 entry). Assume that both populations are
normally distributed.
Solution:
Step 1. Find the mean of the paired differences, d-bar . Round
your answer to one decimal place....

Given two independent random samples with the following
results:
n1
=
11
n2
=
13
xbar1
=
162
xbar^2
=
130
s1
=
31
s2
=
30
Use this data to find the 95% confidence interval for the true
difference between the population means. Assume that the population
variances are equal and that the two populations are normally
distributed.
Copy Data
Step 1 of 3: Find the critical value that should be used in
constructing the confidence interval. Round...

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