If n = 300 and X = 90, construct a 90% confidence interval
estimate of the population proportion.
(answer) < pie < (answer)
Note: the "< " listed above are suppos to be
underlined.
Use the standard normal distribution or the? t-distribution to
construct a 90 confidence interval for the population mean. Justify
your decision. If neither distribution can be? used, explain why.
Interpret the results. In a recent? season, the population standard
deviation of the yards per carry for all running backs was 1.37.
The yards per carry of 25 randomly selected running backs are shown
below. Assume the yards per carry are normally distributed.
2.4 4.5 3.6 5.3 4.8 6.8 5.9 4.9...
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 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 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 proportion when p
overbar=0.66 and the margin of error equals 8%.
n=_______(Round up to the nearest integer.)
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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...
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.
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.