Which confidence level would produce the widest interval when estimating the mean of a population from the mean and standard deviation of a sample
of that population?

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents