Final answer:
The sample mean years to maturity for corporate bonds is 4.75 years, and the sample standard deviation is 0.99 years.
Step-by-step explanation:
In order to calculate the sample mean and standard deviation for corporate bonds, we need to use the given data from the study:
For Company A: sample mean = 5 years, sample standard deviation = 1.2
For Company B: sample mean = 4.5 years, sample standard deviation = 0.8
To find the sample mean years to maturity for corporate bonds, we can take the average of the sample means for Company A and Company B: (5 + 4.5) / 2 = 4.75 years.
To find the sample standard deviation, we can take the weighted average of the sample standard deviations for Company A and Company B: sqrt((14 * (1.2)^2 + 19 * (0.8)^2) / 33) ≈ 0.99 years.