Author Question: Find the 90th percentile. What will be an ideal response?[br][br][b][color=#151B54]Question ... (Read 54 times)

biggirl4568 · **on:** Jun 24, 2018

Find the 90th percentile.

What will be an ideal response?

Question 2

The irregular component of a time series exhibits a tendency to grow or decrease rather steadily over long periods of time.

Indicate whether the statement is true or false

stillxalice · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

Find x0 such that P(X x0 ) = 0.90 = P(Z z0 ).
Since the area to the left of z0 is greater than 0.5, z0 must be larger than zero such that P(0 < Z < z0 ) = 0.40, so z0 = 1.28. Thus, x0 = 75 + (1.28 )(4 ) = 80.12

Answer to Question 2

FALSE