In a forensic study of the relation between time since death (hrs) and the nostril temperature in deer (F) , a regression analysis of y = time since death on x = nostril temperature was performed. Summary quantities from this analysis yield: n = 384 S_xx = 49,999.464 s_e = 1.997
a) Calculate the estimated standard deviation of a + bx* for x* = 80.
b) For what value x* is the estimated standard deviation of a + bx* smallest, and why?

Question

In a forensic study of the relation between time since death (hrs) and the nostril temperature in deer (F) , a regression analysis of y = time since death on x = nostril temperature was performed. Summary quantities from this analysis yield: n = 384

S_xx = 49,999.464

s_e = 1.997
a) Calculate the estimated standard deviation of a + bx* for x* = 80.
b) For what value x* is the estimated standard deviation of a + bx* smallest, and why?

Quizplus · Accepted Answer

The Answer of In a forensic study of the relation between time since death (hrs) and the nostril temperature in deer (F) , a regression analysis of y = time since death on x = nostril temperature was performed. Summary quantities from this analysis yield: n = 384 S_xx = 49,999.464 s_e = 1.997 a) Calculate the estimated standard deviation of a + bx* for x* = 80. b) For what value x* is the estimated standard deviation of a + bx* smallest, and why?

In a Forensic Study of the Relation Between Time Since