Week 3 Learning TDistribution QA.docx - Question 1...

Question 1
Construct a 93% confidence interval for a sampling distribution having a mean of 150, standard
deviation of 20, and a size of 16.
140.25 to 159.75
141.25 to 158.77
7% to 93%
139.34 to 160.66
Question 2
Construct a 90% confidence interval for a sampling distribution having means of {4, 4, 4, 4.2,
4.2, 4.3, 4.3, 4.3, 4.4, 4.4, 4.4, 4.4, 4.5, 4.5, 4.6, 4.7, 4.7, 4.7, 4.8, 4.8, 4.8, 4.9, 4.9, 4.9, 4.9}.
10% to 90%
Question 3
As the confidence level increases for the same sampling distribution, the confidence interval
_____________.
Question 4
Construct a 95% confidence interval for a sampling distribution having a mean of 150, standard
deviation of 20, and a size of 16.

Question 5
What is the degree of freedom in a T-distribution?