In a random sample of 25 ? people, the mean commute time to work was 30.4 minutes and the standard deviation was 7.1 minutes. assume the population is normally distributed and use a? t-distribution to construct a 90? % confidence interval for the population mean ? . what is the margin of error of ? ?

What describes horizontal cross section of the right rectangle 6m 8m 5m

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.

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days