lab6f09_ans

lab6f09_ans - Stat 401C Problem 1 Lab#6 Solution Key Fall...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Stat 401C Lab#6 Solution Key Fall 2009 Problem 1 a) The normal probability plot ( see attached JMP output ) shows that the points fall approximately on a straight line supporting the assumption that the paired differences of PCB measurements at the sites is a sample from a normal distribution. The box plot also supports this conclusion. See the attached Excel output for the calculation of d s and d s . b) Let 1996 1982 µµ µ = d where 1982 and 1996 are assumed to be the means of PCB contents in gull egg populations during those years. Assuming that the paired differences in PCB content is a sample from normal population with mean d the following hypotheses can be tested: 0 : 0 d H vs. 0 : > d a H d c s d t 0 = = 23 . 11 13 / 46 . 12 80 . 38 = 681 . 2 12 , 01 . = t , that is R.R. is 681 . 2 > t Since c t is in R.R. we rewject the null hypothesis at 01 . = α and conclude that there has been a significant decrease in mean PCB content in the herring gull egg population.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

lab6f09_ans - Stat 401C Problem 1 Lab#6 Solution Key Fall...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online