Assume that the time saved by putting FASTags on cars is normally distributed with true standard deviation 0.75. a) Compute 96% confidence interval for the true average time saved based on 35 cars...

Assume that the time saved by putting FASTags on cars is normally distributed with true
standard deviation 0.75.
a) Compute 96% confidence interval for the true average time saved based on 35 cars with
a sample average of time saved being 8.57 minutes.
b) Will your answer change if time saved by putting FASTags on cars is not normally
distributed?
c) How large must be the sample size if the width of the 92% interval is to be 0.50.