Show that, if 4 minutes have already elapsed, the probability ...

[storky111]

Show that, if 4 minutes have already elapsed, the probability that a further 4 minutes will elapse before the next occurrence is e-8. Explain your answer in words.
 
  What will be an ideal response?

Question 2

Which of the following statements must be true, if the regression sum of squares (SSR) is 83.6?
 
  A) The correlation coefficient is 0.95
  B) The slope of the regression line is positive.
  C) The error sum of squares (SSE) is larger than or equal to 83.6
  D) The total sum of squares (SST) is larger than or equal to 83.6

[cuttiesgirl16]

Answer to Question 1

P(X > 8  X > 4 ) = P(X > 8 ) / P(X > 4 ) = e-8 / e-4 = e-4
The probability of an occurrence within a specified time in the future is not related to how much time has passed since the most recent occurrence.

Answer to Question 2

D

[storky111]

Thanks for the timely response, appreciate it

[ryhom]

Gracias!