Stats 251 Final Exam Idaho correctly
answered already passed
If we want to increase the precision of a confidence interval by making the interval narrower,
we can do... - correct answer ✔✔Decrease confidence level and increase the sample size
Find the appropriate value of t for 95% CI with n=31. (Use statdistributions.com) - correct
answer ✔✔2.043
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans and finds they average 128.2
ounces with a standard deviation of 2 ounces. Is there sufficient evidence that the filling
machine is set too high (filling the cans with too much paint)? (Assume all assumptions are met)
What are the null and alternative hypotheses? - correct answer ✔✔H0- mean=128 Ha-
mean>28
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what is the value of the test
statistic? (Assume all assumptions are met)
One Sample
t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949
, alternative hypothesis: true mean is greater than 12895 percent confidence interval: 127.6387
Infsample estimates:mean of x 128.068 - correct answer ✔✔0.26907
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what are the degrees of
freedom? (Assume all assumptions are met)
One Sample t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949
alternative hypothesis: true mean is greater than 12895 percent confidence interval: 127.6387
Inf
sample estimates:
mean of x 128.068 - correct answer ✔✔29
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what is the pvalue? (Assume
all assumptions are met)
One Sample t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949alternative hypothesis: true mean is greater than 12895
percent confidence interval: 127.6387 Inf
sample estimates:mean of x 128.068 - correct answer ✔✔0.3949
The null hypothesis, H0 , is the initial/base claim and the alternative hypothesis, Ha, is the
researcher(s) claim. (T/F) - correct answer ✔✔True
answered already passed
If we want to increase the precision of a confidence interval by making the interval narrower,
we can do... - correct answer ✔✔Decrease confidence level and increase the sample size
Find the appropriate value of t for 95% CI with n=31. (Use statdistributions.com) - correct
answer ✔✔2.043
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans and finds they average 128.2
ounces with a standard deviation of 2 ounces. Is there sufficient evidence that the filling
machine is set too high (filling the cans with too much paint)? (Assume all assumptions are met)
What are the null and alternative hypotheses? - correct answer ✔✔H0- mean=128 Ha-
mean>28
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what is the value of the test
statistic? (Assume all assumptions are met)
One Sample
t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949
, alternative hypothesis: true mean is greater than 12895 percent confidence interval: 127.6387
Infsample estimates:mean of x 128.068 - correct answer ✔✔0.26907
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what are the degrees of
freedom? (Assume all assumptions are met)
One Sample t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949
alternative hypothesis: true mean is greater than 12895 percent confidence interval: 127.6387
Inf
sample estimates:
mean of x 128.068 - correct answer ✔✔29
The Umbrella Corporation has companies in many sectors of our economy. One of their paint
manufacturing plants sells cans of paint and uses a machine that has been calibrated to fill the
cans to contain an average of 1 gallon (128 ounces) each. To test whether their machine needs
calibration, the manufacturer takes a random sample of 25 cans. Is there sufficient evidence
that the filling machine is set too high? Using the supplied output, what is the pvalue? (Assume
all assumptions are met)
One Sample t-test
data: evil
t = 0.26907, df = 29, p-value = 0.3949alternative hypothesis: true mean is greater than 12895
percent confidence interval: 127.6387 Inf
sample estimates:mean of x 128.068 - correct answer ✔✔0.3949
The null hypothesis, H0 , is the initial/base claim and the alternative hypothesis, Ha, is the
researcher(s) claim. (T/F) - correct answer ✔✔True
