multiple choice
11/29/2015 Quiz: Quiz 7 --- Confidence intervals
https://usfca.instructure.com/courses/1554912/quizzes/2291735/take 1/2
Quiz 7 Confidence intervals Started: Nov 2 at 12:55pm
Quiz Instructions
1 ptsQuestion 1
alpha, sample mean, sample size
sample mean, standard deviation, degrees of freedom
alpha, standard deviation, sample size
alpha, sample mean, standard deviation
When using the CONFIDENCE.NORM Excel function to determine the margin of error for a population mean having a normal distribution, what three inputs are required?
1 ptsQuestion 2
True
False
CONFIDENCE.T can be used to quickly find the margin of error for a confidence interval for a population mean, but not for a population proportion.
1 ptsQuestion 3
the area to the right of 12 in the tdistribution with 2 degrees of freedom.
the area to the left of 12 in the tdistribution with 2 degrees of freedom.
the area to the left of 2 in the tdistribution with 11 degrees of freedom.
the area to the right of 2 in the tdistribution with 11 degrees of freedom.
T.DIST(2, 12, TRUE) will tell us...
1 ptsQuestion 4
=CONFIDENCE.T(0.05, 6.3, 28)
=CONFIDENCE.T(0.05, 6.3, 27)
=CONFIDENCE.T(0.95, 6.3, 27)
=CONFIDENCE.T(0.95, 37.5, 28)
Which formula returns the margin of error for a 95% confidence interval based on the tdistribution when the sample size is 28, the sample mean is 37.5, and the sample standard deviation is 6.3?
Question 5
11/29/2015 Quiz: Quiz 7 --- Confidence intervals
https://usfca.instructure.com/courses/1554912/quizzes/2291735/take 2/2
Quiz saved at 8:45pm
1 pts
True
False
When the population standard deviation is known, it is best to use the CONFIDENCE.NORM function when computing the margin of error for a confidence interval.
Submit Quiz