Given the following information about a hypothesis test of the difference between two means based on independent random samples, which one of the following is the correct rejection region at a significance level of .05? ha: μa > μb, 1 = 12, 2 = 9, s1 = 4, s2 = 2, n1 = 13, n2 = 10.

a. reject h0 if t > 1.721.
b. reject h0 if t > 1.645.
c. reject h0 if t > 1.782.
d. reject h0 if t > 2.08.
e. reject h0 if t > 1.96.

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Which position represents spring in the southern hemisphere? a) b) c) d)