Time for some tedious by hand practice just to see if you can get the numbers right.  Using the following information,...

Time for some tedious by hand practice just to see if you can get the numbers right.  Using the following information, calculate the t-test statistic by hand.

a. _¯x1=62   x2=60   n1=10  n2=10  s2/1=2.45  s 2/2=3.16

b. x1=158   x2=157.4   n1=22   n2=26   s 2/1=2.06  s 2/2=2.59

c. x1=200   x2= 198   n1=17   s 2/1=2.45   s 2/2=2.35