question 4

A study was conducted by the Department of Zoology at the Virginia Tech to estimate the difference in the amount of the chemical orthophosphorus measured at two different stations on the James River. Orthophosphorus was measured in milligrams per liter. Fifteen Specimens were collected from station 1, and 12 specimens were obtained from station 2. The 15 specimens from station 1 had and an average orthophosphorus content of 3.84 milligrams per liter and a standard deviation of 3.07 milligrams per liter, while the 12 specimens from station 2 had an average of content of 1.49 milligrams per liter and a standard deviation of 0.8 milligram per liter. Assume that the observations came from normally distributed populations with different variances. Set up the hypotheses if the researcher suspects that the average orthophosphorus contents are different at the two stations. O Ho:H1- H2 SO VS Ha: H1-H2>O OHo:H1 - H2ZO VS Ha: H1 - H2