10.22 Test the hypothesis H0 : s2x

= s2y H1 : s2x 7 s2y using the following data.

a. s2x

= 125, ny = 45; s2y

= 51, ny = 41

b. s2x

= 125, ny = 45; s2y

= 235, ny = 44

c. s2x

= 134, ny = 48; s2y

= 51, ny = 41

d. s2x

= 88, ny = 39; s2y

= 167, ny = 25