In a Forensic Study of the Relation Between Time Since

question 5

Essay

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?

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