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# Temple - CJ 2602 - Class Notes - Week 13

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Temple - CJ 2602 - Class Notes - Week 13

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Regression Notes
If the problem says test for a negative/ positive than it’s 2 tail
Step 1: H
– there is no correlation between years of education and number of arrests    H – there is a correlation between …..  Step 2: df  N-2  (8-2=6 (how many rows) df=6  Step 3:
t-crit = +/-2.447(+/- because it is 2 tailed)
Step 4:
t-obt = -4.49 (always given!)
Step 5:
Accept the alternative/null hypothesis
This we accept the alternative hypothesis because -4.49 falls outside the t-
crit
R = -0.88 which is both negative and strong
R
2  = .77 = 77%  77% of the number of arrests can be attributed by years of education  Simple regression
Y = a +bx
Y = predicted value of DV at IV
a= y-intercept –in SPSS- constant
b= slope of co-efficient
x = value of IV
EX: y=20 + -.5(10)
20 -5 = 15 y =15
As age ate 1
st  arrest increases by 1 year (IV)  The total # of arrest decreases by .5 (DV) (decreases/increase depends on
the sign -/+) .5 = b-value)
Multiple regression
Y=a +(b
1 x 1 ) +(b 2 x 2 ) …….  b 1 x = age at first arrest  b 2 x = years of education EX:
Y = 20 + -5(x
1 ) + -.75(x 2 As years of education increased by 1 the total number of arrests decreases
by .75
If your sig (p-value) above 0.05  it doesn’t work!
If it is below it works!!

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##### Description: These are class notes on regression (not SPSS)
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