Question
In: Statistics and Probability
2. A sample of 25 items yields X(This is X with bar ¯ on top) =...
2. A sample of 25 items yields X(This is X with bar ¯ on top) = 60 grams and s = 5 grams. Assuming a normal parent distribution, construct a 99 percent confidence interval for the population mean weight.
3. Of a random sample of 600 trucks at a bridge, 120 had bad
signal lights. Construct a 90 percent confidence interval for the
percentage of trucks that had bad signal lights.
4.A cable TV company wants to estimate the percentage of cable
boxes in use during an evening hour. An approximation based on
previous surveys is 25 percent. The company wants the new estimate
to be at the 90 percent confidence level and within 3 percent of
the actual proportion. What sample size is needed?
5. Suppose that 55 percent of the voters in a particular region
support a candidate. Find the probability that a sample of 900
voters would yield a sample proportion in favor of the candidate
within 2 percentage points of the actual proportion.
Solutions
orchestra answered 2 years agoRelated Solutions
A sample of 25 items yields X = 60 grams and s = 5 grams. Assuming...
A sample of 25 items yields X = 60
grams and s = 5 grams. Assuming a normal parent distribution,
construct a 99 percent confidence interval for the population mean
weight.
1)What is a sampling distribution for the sample mean, x-bar? Explain. Is x-bar a random variable?...
1)What is a sampling distribution for the sample mean, x-bar?
Explain. Is x-bar a random variable? Why do you think so?
2) We learned standard error of the mean ( read sigma xbar in
denotation) or standard deviation of sample mean. When the size(n)
of the sample collected from a infinite population is greater than
1, why is the standard error of the mean smaller than
the standard deviation of X, population ? Explain conceptually
or/and algebraically. Think of formula for...
A random sample from a normal population yields the following 25 values:
A random sample from a normal population yields the following 25 values: 90 87 121 96 106 107 89 107 83 92 117 93 98 120 97 109 78 87 99 79 104 85 91 107 89a. Calculate an unbiased estimate of the population variance.b. Give approximate 99% confidence interval for the population variance.c. Interpret your results and state any assumptions you made in order to solve the problem.
A sample of 12 items yields Picture = 48.5 grams and s = 1.5 grams. Assuming...
A sample of 12 items yields Picture = 48.5 grams and s = 1.5
grams. Assuming a normal distribution, construct a 90 percent
confidence interval for the population mean weight.
A sample of 12 items yields Picture = 48.5 grams and s = 1.5 grams. Assuming...
A sample of 12 items yields Picture = 48.5 grams and s = 1.5
grams. Assuming a normal distribution, construct a 90 percent
confidence interval for the population mean weight.
A sample of 25 items provides a sample standard deviation of 6. (a) Compute the 90%...
A sample of 25 items provides a sample standard deviation of 6.
(a) Compute the 90% confidence interval estimate of the population
variance. (Round your answers to two decimal places.) ____ to ____
(b) Compute the 95% confidence interval estimate of the population
variance. (Round your answers to two decimal places.) _____to _____
(c) Compute the 95% confidence interval estimate of the population
standard deviation. (Round your answers to one decimal place.)
_____to ____
1. A simple random sample of 25 items resulted in a sample mean of 28 and...
1.
A simple random sample of 25 items resulted in a sample mean of
28 and a standard deviation of 7.5. Construct a 95% confidence
interval for the population mean.
Select one:
A. 24.904 to 31.096
B. 25.905 to 32.096
C. 26.324 to 29.432
D. None of the above answers is correct
2.
A simple random sample of 25 items resulted in a sample mean of
28 and a standard deviation of 7.5. Construct a 99% confidence
interval for the...
25. What is the seventh step in the construction of the X bar chart? 26. Explain...
25. What is the seventh step in the construction of the X bar
chart?
26. Explain how the centerline and control limits of the R chart
are mathematically calculated.
28. What is the eighth step in the construction of the X bar
chart?
35. What is the ninth step in the construction of the X bar
chart?
36. What are the four steps taken to revise the charts?
A simple random sample of 25 items from a normally distributed population resulted in a sample...
A simple random sample of 25 items from a normally distributed
population resulted in a sample mean of 80 and a sample standard
deviation of s=7.5. Construct a 95% confidence interval for the
population mean.
A random sample of size 17 Yields x=3.49 and s^2=1.53. Complete parts A thru E Below....
A random sample of size 17 Yields x=3.49 and s^2=1.53. Complete
parts A thru E Below.
a. Calculate a confidence interval for the population mean whose
confidence level is 0.99.
b. Calculate a confidence interval for the population mean whose
confidence level is 0.98.
c. Calculate a confidence interval for the population mean whose
confidence level is 0.95.
d. Calculate a confidence interval for the population mean whose
confidence level is 0.90.
e. Calculate a confidence interval for the population...
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