3. The article “Adiabatic Humidification of Air with Water in a Packed Tower” (Chem. Eng. Prog., 1952: 362–370) reports data on gas film heat transfer coefficient (Btu/hr ft2 on °F) as a function of gas rate (factor A) and liquid rate (factor B).

B 1(190) 2(250) 3(300) 4(400)

1(200) 200 226 240 261 2(400) 278 312 330 381 A 3(700) 369 416 462 517 4(1100) 500 575 645 733

a. After constructing an ANOVA table, test at level .01 both the hypothesis of no gas-rate effect against the appropriate alternative and the hypothesis of no liquid-rate effect against the appropriate alternative.

b. Use Tukey’s procedure to investigate differences in expected heat transfer coefficient due to different gas rates.

c. Repeat part

(b) for liquid rates.