A sample of years to maturity and yield for corporate bonds taken fromBarronsis given below.

Years to Maturity	Yield		Years to Maturity	Yield
18.00		2.101		17.25		0.994
14.00		2.967		16.25		8.067
2.50		5.926		12.25		4.253
6.50		0.986		19.75		4.035
1.00		3.944		30.00		2.552
22.75		5.499		10.00		4.126
8.50		7.750		14.75		2.389
11.50		2.442		24.00		5.313
7.00		5.323		8.00		1.147
15.75		1.795		25.25		2.764
29.25		1.472		4.00		1.660
21.50		5.554		27.00		5.093
18.50		3.397		5.50		1.080
27.25		5.832		22.50		5.841
25.75		1.447		20.75		6.051
13.00		7.178		28.25		3.296
5.00		2.759		11.00		1.223
19.25		6.286		5.00		5.372
3.25		2.248		24.50		5.863
9.75		1.970		1.75		6.511

a.What is the sample mean years to maturity for corporate bonds and what is the sample standard deviation?

Mean	years (to 2 decimals)
Standard deviation	years (to 2 decimals)

b.Develop a confidence interval for the population mean years to maturity. Round the answer to two decimal places.

, years

c.What is the sample mean yield on corporate bonds and what is the sample standard deviation?

Mean	% (to 4 decimals)
Standard deviation	% (to 4 decimals)

d.Develop a confidence interval for the population mean yield on corporate bonds. Round the answer to four decimal places.

, percent