6. Jack's Auto Insurance Company customers sometimes have to wait a long time to speak

to a customer service representative when they call regarding disputed claims. A random

sample of 20 such calls yielded a mean waiting time of 22 minutes. Population standard

deviation of 6 minutes and assume that such waiting time for the population follow a

leftward skewed distribution. Construct a 90% confidence interval for the population

mean of such waiting times. Draw graph

7. A random sample of 45 acres gave a mean yield of wheat equal to 41.2 bushels per acre

and standard deviation of 3 bushels,. Assuming that shape population distribution is

rightward. Construct a 99% confidence interval for the population mean. Draw graph