Question
In: Statistics and Probability
Construct a 90% confidence interval for the population standard deviation if a sample size 20 has...
Construct a 90% confidence interval for the population standard deviation if a sample size 20 has standard deviation of 10. (a) Find the critical value(s). (Round to three decimal places) (b) Construct the confidence interval. (Round to three decimal places) (c) Conclusion.
Solutions
Expert Solution
Solution:
Confidence interval : 7.939 < σ < 13.704 (Rounded to three decimal places)
orchestra answered 1 year agoRelated Solutions
Exercise 3. Construct a 90% confidence interval for the population standard deviation σ of a random...
Exercise 3. Construct a 90% confidence interval for the
population standard deviation σ of a random sample of 30 men who
have a mean weight of 173.5 pounds with a standard deviation of
12.2 pounds. Assume the population is normally distributed.
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population mean when sigma
equals 67 and the margin of error equals 10.
n=???????
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population proportion when p
over bar equals 0.64 and the margin of error equals 7%.
n=???
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population proportion for the
following sample proportions when the margin of error equals
8%.
a. p over bar equals 0.10
b. p over bar equals 0.20
c. p over bar equals 0.30
Click the icon to view a table of standard normal cumulative
probabilities.
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population proportion when p
overbar=0.66 and the margin of error equals 8%.
n=_______(Round up to the nearest integer.)
___________________________________________________________________________
A restaurant would like to estimate the proportion of tips that
exceed 18% of its dinner bills. Without any knowledge of the
population proportion, determine the sample size needed to
construct a 98% confidence interval with a margin of error of no
more than 6% to...
Construct a 95% confidence interval for the population standard deviation of a random sample of 15...
Construct a 95% confidence interval for the population standard
deviation of a random sample of 15 crates which have a mean weight
of 165.2 points and a standard deviation of 12.9 pounds. Assume the
population is normallyn distributed.
A. 9.9, 18.8
B. 9.4, 20.3
Please show work.
You are constructing a 90% confidence interval for one population mean. A sample if size 20...
You are constructing a 90% confidence interval for one
population mean. A sample if size 20 is taken from the population
of interest. The mean from the sample is 5 and the standard
deviation is 1.5.
What is the t-score to be used in calculating Margin of Error?
(do not round)
Construct a 99% confidence interval on the population variance and the population standard deviation for the...
Construct a 99% confidence interval on the population variance
and the population standard deviation for the data listed
below:
91.8, 112.1, 138.3, 90.6, 136.6, 113.6, 101.5, 123.6, 81.4,
119.2, 111.4, 89.4, 110.5, 80.5, 94.8, 117.0, 105.7, 146.6, 138.6,
99.9, 106.6
The 90% confidence interval for the population mean when a random sample of size 16 was...
The 90% confidence interval for the population mean when a
random sample of size 16 was taken from a very large population and
its mean was calculated to be 22 and its standard deviation was
calculated to be 3. (The population had a normal
distribution with an unknown standard
deviation.) No concluding statement is
required.
a) The 90% confidence interval for the population mean when a random sample of size 16...
a) The 90% confidence interval for the population mean when a
random sample of size 16 was taken from a very large population and
its mean was calculated to be 22 and its standard deviation was
calculated to be 3. (The population had a normal distribution with
an unknown standard deviation.) No concluding statement is
required.
b) Determine the p-value for testing: H0: µ = 15 Ha: µ > 15
when a random sample of size 18 was taken from...
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