Question
In: Statistics and Probability
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 a normal population whose standard deviation is unknown and the value of the test statistic equals 2.35.
c) The 98% confidence interval for the population proportion of successes when a random sample of size 80 was taken from a very large population and the number of successes in that sample was counted to be 20. No concluding statement is required.
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Solutions
orchestra answered 2 years agoRelated Solutions
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.
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.
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)
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=???
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.
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...
Determine an approximate sample size required to construct a 90%confidence interval for the mean number...
Determine an approximate sample size required to construct a 90%
confidence interval for the mean number of miles on four-year -old
Honda Civics, with a margin of error of 1000 miles. Assume that a
preliminary study showed that the standard deviation is estimated
to be 19,700 miles.
A random sample of 32 washing machines had a mean replacement
time of 10.6 years and a population standard deviation of 2.1
years. Find the margin of error that corresponds to 99% confidence...
Find the 90% confidence interval for population mean if a sample returned the values 68, 104,...
Find the 90% confidence interval for population mean if a sample
returned the values
68, 104, 128, 122, 60, 64
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