67.

a. Let a and b be constants and let yi  axi  b for i  1, 2, . . . , n. What are the relationships between and and between sx 2 and s y 2?

b. The Australian army studied the effect of high temperatures and humidity on human body temperature

(Neural Network Training on Human Body Core Temperature Data, Technical Report DSTOTN-0241, Combatant Protection Nutrition Branch, Aeronautical and Maritime Research Laboratory). They found that, at 30C and 60%

relative humidity, the sample average body temperature for nine soldiers was 38.21C, with standard deviation .318C. What are the sample average and the standard deviation in F?