to explore this relationship in women, a nutritionist randomly selected 60 women
INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS
1. (40 points) A person’s muscle mass is expected to decrease with age. To explore
this relationship in women, a nutritionist randomly selected 60 women (15 women
from each 10-year age group, beginning with age 40 and ending with age 79). Let
X be age, and Y a measure of muscle mass. The data “muscle.csv”(the 1st
column includes Y and the 2nd for X) can be found on Canvas.
(a) (5 points) Draw a scatter plot of Y vs. X. Comment on the relationship
between Y and X in a sentence or two.
(b) Is there a linear association between Y and X?
i. (3 points) Please justify your answer with the estimate of correlation
coefficient, and assess it for significance by providing 95% confidence
ii. (2 points) Summarize the result in a sentence or two.
(c) (5 points) Fit the following model using PROC REG,
Yi = β0 + β1Xi + i
, i ∼ N(0, σ2
bβ0, Var( bβ1), Var( bβ0), and σb
(d) (6 points) Give interpretations for bβ0 and bβ1 you obtained in (c), and provide
95% confidence intervals for β0 and β1, respectively.
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Secure Systems Programming
Referral Coursework: Secure
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CS 340 Final Project Guidelines and Rubric
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