A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Need help with parts (a) to (f) on this Intro to Probability and Statistics homework problem. You can use Excel to help you complete this problem. Below the the homework problem, is the data set in Excel that goes with this problem and the problem 1 Regression output image. Make sure the answers that you provide are lengthy. Also, make sure your handwriting is neat and readable.

 

Homework Problem

On Homework Assignment 1, the general consensus was that I was not in a relationship.
Although I definitly did not ask for your opinions... many of you commented
that I have some psychological work to do before entering into a committed
relationship.


Since then, I have collected psychological data from a group of people, measuring
their “Big Five” traits: Openness, Conscientiousness, Extroversion, Agreeableness,
and Neuroticism. I also had these people provide a “Relationship Satisfaction
Score” on a continuous scale from 0 to 100. (You can assume that the experiment
was conducted well, the sampling was done properly, etc.)


For our purposes, we’ll say that anybody with a Relationship Satisfaction Score
of 70 or greater is in a “good relationship”, and anybody with a Relationship
Satisfaction Score below 70 is in a “bad relationship”. Assume that I have the
following profile:


Trait                                        Score
Openness                               70
Conscientiousness                 100
Extroversion                            80
Agreeableness                        60
Neuroticism                             90


Using the information provided here, the data in the “Relationships” sheet, and
the “Problem 1 Regression Output” image:


a) Are any of the variables irrelevant, statistically speaking?


b) Assuming that I want to be in a relationship, which of the following
variables would I want to work on increasing, and which should I try
to minimize? How can we tell?


c) How much variability is being explained by this model, and which metric
is telling you that?


d) The residual plots from the regression analysis are provided. Using these
plots, verify that all of the regression assumptions are met.


e) Comment on the overall adequacy of the linear model that we built.


f) What is my projected Relationship Satisfaction Score, and do I have a
shot at a good relationship?

 

 

 

Data Set 

Neuroticism Openness Conscientiousness Agreeableness Extroversion RELATIONSHIP SATISFACTION SCORE
163.5  70.1  52.3  93.1  78.2  51
9.9  99  179  91.1  84.5  75
6.7  97.9  91.9  86.5  88.4  76
22.2  84.3  39.8  94.6  92.4  72
128.6  56  8.1  81.3  60.6  48
17.6  93.4  95.6  91.7  91.3  78
4.7  98.8  187.6  94.8  97  77
27.1  89.5  94.2  95.5  90.4  73
15.9  84.5  66.4  95.2  95.5  72
100.3  93.9  256.2  56.5  56  54
51.8  67.8  5.8  37.2  32.5  61
3.6  99.8  208.5  97.7  97  76
72.9  50  17.5  68.2  70.4  58
4.8  97.2  251  98.8  99.3  81
32  75.2  47.6  98.6  97.5  69
101.2  41  10.2  85.2  72.1  55
129.1  54.2  12.4  76.7  73.3  50
22.9  84.8  38.2  94.8  97  74
6.2  99  203.1  97.8  98.3  75
3.8  98.9  324  99.6  98.5  82
19.1  92.6  59.3  90.8  90.7  74
8.7  99.8  177  95  96.8  74
99.6  89.6  20.5  72.2  75.3  50
5.4  99.7  196.4  95.6  95.8  74
128  31.1  10.4  70.6  60.8  51
84  58  24  72.8  76  59
16.2  93.1  153.9  99.2  99.9  75
27.5  97.4  42.9  99.6  98.5  68
89.7  56.1  9.7  94.6  89.4  53
38.7  88.8  65.6  83.8  88.5  65
123.7  61.3  22.9  60.1  54.8  53
18.5  94.1  145.1  99.1  98.2  77
22  93.9  53.9  84.4  83.9  75
5  99.5  204.3  96.9  96.7  76
3.6  95.2  244.4  99.1  99.7  80
7.4  96.3  864.4  95.7  96.6  82
17.6  98.5  36.4  90.1  90.1  71
12.2  97.7  151.2  87.9  87.3  74
8.6  86.6  247  96.7  96.5  76
 
 
 
 
 
 
 
Problem 1 Regression Output Image
 
 
 
 
 
 
Coefficients
Term
Constant
Neuroticism
Openness
Conscientiousness
Agreeableness
Extroversion
Coef SE Coef
95% CI
66.29
5.14
(55.85, 76.74)
-0.1936
0.0187 (-0.2317, -0.1554)
0.0153
0.0406 (-0.0673, 0.0980)
0.00999
0.00337 (0.00314, 0.01684)
0.111
(-0.020, 0.432)
0.118
(-0.361, 0.119)
0.206
-0.121
T-Value
12.91
-10.33
0.38
2.97
1.85
-1.02
P-Value
0.000
0.000 3.89
0.709
3.05
0.006
1.32
0.073 12.42
0.313
17.50
VIF
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Transcribed Image Text:Coefficients Term Constant Neuroticism Openness Conscientiousness Agreeableness Extroversion Coef SE Coef 95% CI 66.29 5.14 (55.85, 76.74) -0.1936 0.0187 (-0.2317, -0.1554) 0.0153 0.0406 (-0.0673, 0.0980) 0.00999 0.00337 (0.00314, 0.01684) 0.111 (-0.020, 0.432) 0.118 (-0.361, 0.119) 0.206 -0.121 T-Value 12.91 -10.33 0.38 2.97 1.85 -1.02 P-Value 0.000 0.000 3.89 0.709 3.05 0.006 1.32 0.073 12.42 0.313 17.50 VIF
Regression Equation
RELATIONSHIP SATISFACTION SCORE= 66.29 -0.1936 Neuroticism + 0.0153 Openness
+ 0.00999 Conscientiousness + 0.206 Agreeableness
- 0.121 Extroversion
Coefficients
Term
Constant
Neuroticism
Openness
0.0153 0.0406 (-0.0673, 0.0980)
Conscientiousness 0.00999 0.00337 (0.00314, 0.01684)
0.206 0.111 (-0.020, 0.432)
Agreeableness
Extroversion
Model Summary
S R-sq R-sq (adj)
2.72626 94.35% 93.50%
Percent
Frequency
99
90
50
10
10.0
7.5
5.0
2.5
Coef SE Coef
95% CI
66.29 5.14 (55.85, 76.74)
-0.1936 0.0187 (-0.2317, -0.1554) -10.33
0.38
2.97
1.85
-0.121 0.118 (-0.361, 0.119) -1.02
0.0
-5.0
-2.5
Residual Plots for RELATIONSHIP SATISFACTION SCORE
Normal Probability Plot
Versus Fits
0.0
Residual
Histogram
-6.0 -4.5 -3.0 -1.5
0.0
Residual
2.5
1.5 3.0
T-Value P-Value VIF
12.91 0.000
5.0
4.5
Residual
5.0
2.5
0.0
-2.5-
-5.0-
5.0
2.5
0.0
-2.5
-5.0-
0.000 3.89
0.709 3.05
0.006 1.32
0.073 12.42
0.313 17.50
1
50
5
10
70
60
Fitted Value
Versus Order
15
20
25
Observation Order
30
80
35
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Transcribed Image Text:Regression Equation RELATIONSHIP SATISFACTION SCORE= 66.29 -0.1936 Neuroticism + 0.0153 Openness + 0.00999 Conscientiousness + 0.206 Agreeableness - 0.121 Extroversion Coefficients Term Constant Neuroticism Openness 0.0153 0.0406 (-0.0673, 0.0980) Conscientiousness 0.00999 0.00337 (0.00314, 0.01684) 0.206 0.111 (-0.020, 0.432) Agreeableness Extroversion Model Summary S R-sq R-sq (adj) 2.72626 94.35% 93.50% Percent Frequency 99 90 50 10 10.0 7.5 5.0 2.5 Coef SE Coef 95% CI 66.29 5.14 (55.85, 76.74) -0.1936 0.0187 (-0.2317, -0.1554) -10.33 0.38 2.97 1.85 -0.121 0.118 (-0.361, 0.119) -1.02 0.0 -5.0 -2.5 Residual Plots for RELATIONSHIP SATISFACTION SCORE Normal Probability Plot Versus Fits 0.0 Residual Histogram -6.0 -4.5 -3.0 -1.5 0.0 Residual 2.5 1.5 3.0 T-Value P-Value VIF 12.91 0.000 5.0 4.5 Residual 5.0 2.5 0.0 -2.5- -5.0- 5.0 2.5 0.0 -2.5 -5.0- 0.000 3.89 0.709 3.05 0.006 1.32 0.073 12.42 0.313 17.50 1 50 5 10 70 60 Fitted Value Versus Order 15 20 25 Observation Order 30 80 35
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