] Negative correlation
- A high score on one variable is associated with a low score
on the other variable and vice versa
: Zero correlation
I Example: Positive correlation
«- Among people that have smoked sometime in their lives,
what is the relationshi
. [e of n = 20 scores
12. 'What is the sample variance and the. estimated standard error for a samp
with 88 = 144? 52 m 7. 5.8;3 362
35 144
2: mm:
5 n_1 19 758
_ 52* 7.58m62
5 n'" 20 "'
' 2 'sme
14. A sample of n = 40 scores has a mean of M = 80 and
S, = 55
n. 1
_ 551 SS
2 551 + 552 1800 + 4200
5, = - = 260.87
df1+df2 9+14
3 . If random samples, each with n = 100 scores , are selected from a normal population with p =
160 and 0 = 36, how much difference, on average, should there be between a sample m
Dependent Samples
I Dependent Samples
- We might test twins
Matched subjects design
Dependent Samples
1 Dependent Samples
Dependent Samples
- Because we're testing twins, the two groups (A and B) should
differ little on cognitive factors
' We have contr