A random sample of 81 Automobiles traveling on a section of an interstate showed an average speed of 60 mph The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13 5 mph Question 1 ) If we are interested in determining an interval e...

By def So We have to use normal tabulated values fo ...

A random sample of 81 Automobiles traveling on a section of an interstate showed an average speed

Question:

A random sample of 81 Automobiles traveling on a section of an interstate showed an average speed of 60 mph. The of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph.
Question 1.) If we are interested in determining an interval estimate for μ at 86.9% confidence, the z value to use is?
a.) 1.96
b.) 1.31
c.) 1.51
d.) 2.00
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...