A simple random sample of 80 items from a population with o = 7 resulted in a sample mean of 35. If required, round your answers to two decimal places. a. Provide a 90% confidence interval for the...

A simple random sample of 80 items from a population with o = 7 resulted in a sample mean of 35.

If required, round your answers to two decimal places.

a.Provide a 90% confidence interval for the population mean.
  to

b.Provide a 95% confidence interval for the population mean.
  to

c.Provide a 99% confidence interval for the population mean