Hints to Homework Assignment II
1. Pretty straightforward. Be careful about interpreting the slope.
2. Just plug in 67 (NOT 0.67) in your regression equation.
3. Think of the common relationships between correlation coefficient, slope and association pattern.
4. Just find the difference between observed and predicted number of deaths.
5. Here we want something that is closely related to the correlation coefficient. You have to use the relation
b
=
r
S
y
S
x
where
S
y
S
x
can be obtained easily from the given equation.
6. This is a “regression towards the mean” problem. Just compare this one with the STA 3024 example done
in class (Chapter 12, Part II notes) and it should be clear.
7. Pretty straightforward. Perform the
t
test and get the pvalue. Then compare your pvalue with the signifi
cance levels (
α
= 0
.
1
,
0
.
05
,
0
.
01
). Be careful about the degrees of freedom of the
t
statistic. You can study
the examples in Chapter 12 part III notes.
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 Spring '08
 TA
 Statistics, Correlation, Regression Analysis, Errors and residuals in statistics, usual way

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