Question
In: Statistics and Probability
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 level.
A football coach randomly selected ten players and timed below long each player took to perform a certain drill. The times (in minutes) were:
7.6 10.4 9.7 8.4 11.8
7.0 6.5 11.1 10.4 12.4
Construct a 95% confidence interval for the mean time for all players
Solutions
orchestra answered 2 years agoRelated Solutions
In each case, find the approximate sample size required to construct a 90% confidence interval for...
In each case, find the approximate sample size required to
construct a 90% confidence interval for p that has sampling error
SE=0.07. a. Assume that p is near 0.4. b. Assume that you have no
prior knowledge about p, but you wish to be certain that your
sample is large enough to achieve the specified accuracy for the
estimate.
a. The approximate sample size is _____
b. The approximate sample size is _____
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 90% confidence interval of the mean birth weight of 195 boys with sample mean...
Construct a 90% confidence interval of the mean birth weight of
195 boys with sample mean =32.7 hg , and standard deviation =6.6
hg.
Group of answer choices
a) 1.645<mean<1.777
b) 31.923<mean<33.477
c) 32%<mean<33%
d) 0.777<mean<1
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.
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...
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.
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