Question

**Use the given degree of confidence and sample data to
construct a confidence interval for the population mean
µ****.**

39 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 21.1 pounds and a standard deviation of 3.7 pounds. What is the 95 percent confidence interval for the true mean weight, µ, of all packages received by the parcel service?

Group of answer choices

(19.7, 22.5)

(19.9, 22.3)

(19.6, 22.6)

(20.1, 22.1)

Answer #1

Confidence interval calculation .

Lower bound = **19.9**

upper bound = **22.3**

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean µ. 31 packages are
randomly selected from packages received by a parcel service. The
sample has a mean weight of 15.7 pounds and a standard deviation of
1.7 pounds. What is the 95 percent confidence interval for the true
mean weight, µ, of all packages received by the parcel service?
(15.2, 16.2) (14.9, 16.5) (15.0, 16.4) (15.1, 16.3)

Use the given degree of confidence and sample data to
construct a confidence interval for the population mean
µ. Assume that the population has a normal
distribution.
A laboratory tested twelve chicken eggs and found that the mean
amount of cholesterol was 239 milligrams with s = 13.3 milligrams.
Construct a 95 percent confidence interval for the true mean
cholesterol content of all such eggs.
Group of answer choices
(230.4, 247.6)
(230.5, 247.5)
(230.6, 247.4)
(232.1, 245.9)

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean µ. Assume that the
population has a normal distribution.
6) The football coach randomly selected ten players and timed
how long each player took to perform a certain drill.
The times (in minutes) were:
7.8
10.6
9.9
8.1
11.5
7.2
6.2
11.1
10.6
12.9
Determine a 95% confidence interval for the mean time for all
players.

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution. Thirty randomly selected
students took the calculus final. If the sample mean was 90 and the
standard deviation s = 6.7, construct a 99% confidence interval for
the mean score of all students

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution. Thirty randomly selected
students took the calculus final. If the sample mean was 95 and the
standard deviation was 6.6, construct a 99% confidence interval
for the mean score of all students.
A.92.95 <μ <97.05
B.92.03 <μ <97.97
C.91.69 <μ <98.31
D.91.68 <μ <98.32

Use the given degree of confidence and sample data to
construct a confidence interval for the population mean μ. Assume
that the population has a normal distribution.
A sociologist develops a test to measure attitudes towards public
transportation, and 27 randomly selected subjects are given the
test. Their mean score is x ¯ = 76.2 and their standard deviation
is s = 21.4. Construct the 95% confidence interval for the mean
score of all such subjects.

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution.
n = 30, = 84.2, s = 18.4, 90% confidence

Use given degree of confidence and sample data to construct a
confidence interval for the population mean. Assume that the
population has a normal distribution. N=30, sample mean =84.6,
s=10.5%, 90% confidence

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean. Assume that the
population has a normal distribution n=96 x=87.1 standard
deviation=6.2; 99% confidence

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution. A laboratory tested twelve
chicken eggs and found that the mean amount of cholesterol was 185
milligrams with s=17.6 milligrams. Construct a 95% confidence
interval for the true mean cholesterol content of all such
eggs.
A.173.7mg <μ <196.3mg
B.173.8mg <μ <196.2mg
C.175.9mg <μ <194.1mg
D.173.9mg <μ <196.1mg

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