Homework 5

Homework 5 - STAT 502 Assignment #5 Coverage: KKMN Chapters...

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

View Full Document Right Arrow Icon
Coverage: Name: ____________________________ SCORE: ____ of 40 Homework Problems—These should be done individually! Please note that HW problems generally do not require SAS coding. #1. (7 points) KKMN Problem 10.07. Ignore the questions in the text and answer the following: a. Compute and interpret 2 1 2 | Y X X r Also perform a hypothesis test to determine whether X2 should be included in a model containing X1. b. Compute and interpret 3 2 1 2 | Y X X X r . Also, perform the corresponding added variable test for X3 given X1 and X2. c. Compute and interpret 2 3 1 2 | Y X X X r . d. Based on your previous results, suggest the most appropriate model. #2. (8 points) Consider the setting in problem KKMN 16.09. Ignore the questions in the text. Tables containing Type I and II SS for various models are given below. The total SS was 3554. Squared Squared Partial Partial Variable DF Type I SS Type II SS Corr Type I Corr Type II X3 1 2635.95947 396.37480 0.74169 0.40273 X4 1 229.80627 86.00677 0.25032 0.12764 X1 1 56.95559 55.45422 0.08275 0.08620 X2 1 43.45297 43.45297 0.06883 0.06883 Squared Squared Partial Partial Variable DF Type I SS Type II SS Corr Type I Corr Type II X3 1 2635.95947 396.37480 0.74169 0.40273 X1 1 231.86141 55.45422 0.25256 0.08620 X2 1 12.34665 43.45297 0.01799 0.06883 X4 1 86.00677 86.00677 0.12764 0.12764 Compute and interpret each of the following: 2 2 2 2 2 2 2 4|3 4|123 1|34 2|13 12|34 24|13 14|3 , , , , , , Y Y Y Y Y Y Y r r r r r r r . Looking at all the values provided above, including those you calculated, what do you think will be the best model? #3. (10 points) Consider the data described in problem #2. Additional output is shown on the last two pages of the assignment. Please answer the following questions. a. Examine the studentized residuals. Discuss anything of interest. Be sure to specify critical values from table A-8B. b. Consider the influence statistics and determine if any of the observations have a large influence on the regression line estimates. Again, specify critical values from tables A-9 and A-10 as appropriate. c.
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 / 4

Homework 5 - STAT 502 Assignment #5 Coverage: KKMN Chapters...

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