# statistics psychology

#### kathilde

##### New member
Four young children were monitored closely over a perios of several weeks to measure how much they watched violetn televisions programs and thier amount of violent behavior toward their plamets. The results were as follows.
Code:
childs code #          weekly viewing of violent TV (hr)        number of violent or
aggressive Acts Toward
playmates
G3368                                         14                                              9
R8904                                           8                                               6
C9890                                           6                                               1
L8722                                           12                                              8
a) make a scatter diagram of the scores
b) describe in words the general pattern of correlation, if any
c) figure the correlation coefficient
d) figure whether the correlation is statistically significant (use .05 signigicance level, two tailed);
e) explain the logic of what you have done, writing as if you were speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing) and
f) give three logically possible directions of causalty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved. (and why)
Thank you

#### tkhunny

##### Moderator
Staff member
a) Well, do it.
b) Well, what do you think?
c) Well, calculate it.
d) That's a great exercise. Let's see what you get.
e) Well, start explaining.
f) Well, let's hear at least one.

No one wants to do your homework for you. Show us SOMETHING!

#### Subhotosh Khan

##### Super Moderator
Staff member
kathilde said:
Four young children were monitored closely over a perios of several weeks to measure how much they watched violetn televisions programs and thier amount of violent behavior toward their plamets. The results were as follows.
Code:
childs code #          weekly viewing of violent TV (hr)        number of violent or
aggressive Acts Toward
playmates
G3368                                         14                                              9
R8904                                           8                                               6
C9890                                           6                                               1
L8722                                           12                                              8
a) make a scatter diagram of the scores
b) describe in words the general pattern of correlation, if any
c) figure the correlation coefficient
d) figure whether the correlation is statistically significant (use .05 signigicance level, two tailed);
e) explain the logic of what you have done, writing as if you were speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing) and
f) give three logically possible directions of causalty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved. (and why)
Thank you
Please share your work/thoughts with us, indicating exactly where you are stuck - so that we may know where to begin to help you

#### kathilde

##### New member
I can do the scatter diagram, but I dont know how to get the correlation coefficient, or the directions of causality and if they are reasonable.

#### tkhunny

##### Moderator
Staff member
There should be a formula in your text book. Do you have one?

Somehting like this: $$\displaystyle \frac{(x-variation)(y-variation)}{\sqrt{(x2-variation)(y2-variation)}}$$

I'm being deliberately vague so you will seek out your available materials.

The other parts yousay are troubling you require logical thought and interpretation. No one can do that for you.

You still have shown no work. Please make an effort.

#### kathilde

##### New member
I am still working on it. :?