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A2 Psych c/work

Hiya, Im doing my coursework, and im on the bit where I do the inferential statistics, but Im not sure which test to do. The experiment was a repeated measures design. And does anyone know where I can find out how to do the tests on tinternet. Thanx XXX

Reply 1

shopaholic_soph

Mann Whitney U, i believe!

what are you doing your coursework aboout? i am doing mine on stress and illness!

Reply 2

Peacey

You can only use a Mann-Whitney-U with independent samples - you're better off running a Sign Test. Clicky Here for a site that'll run the test for you.

Reply 3

supergirl29288

shopaholic_soph

Mann Whitney U, i believe!

what are you doing your coursework aboout? i am doing mine on stress and illness!

Mine's on memory

Reply 4

tana

i did the memory c/w on the levels of processing and i used the wilcoxen ranks stat test!!

Reply 5

Peacey

tana

i did the memory c/w on the levels of processing and i used the wilcoxen ranks stat test!!

A Wilcoxen would be appropriate, a sign test is just less sophisticated (and thus easier!)

Reply 6

notebook

Sorry to but in- I was just about to open a similar post. I'm doing my c/w and trying to figure out my Wilcoxon test values. I've got all my data on excel, ranked and the result is that the positive ranks = 478. The negative ranks = o (as there were none) so I reckon T= 0. I had a sample size of 30 and now I'm stuck! I'm trying to use the table but with T=0 I don't know what I'm looking for!!!

Reply 7

Peacey

what was your value of N?

(to calculate, count the number of pairs of data, ignoring any which had a difference of 0).

N=30

at N=30, T does not exceed the critical values and is therefore the difference is significant

For a one-tailed test: does not exceed critical value of 120, therefore significant at .01 level

For a two-tailed test: does not exceed critical value of 109, therefore significant at .01 level

Incidently, I am badly hungover and may have messed this up - try here for an online calculator

Reply 10

notebook

Thanks, I couldn't get the link to work I'm afraid and I've totally confused myself.

I know that my T+ value + 478 and my T- value = 0.

Therefore my smallest number is 0 which means that T=0.

There were 30 people in my test; none of them got the same answer, or a faster time onthe second condition- which is why I got 0 and not some small or minus number.

Using the table I found n=30, then went accross to the smallest number on that row for T (is less that or equal to) which was 86. Then I looked up and found for a one tailed I got 0.001 and for two tailed I got 0.002.

Now I don't know what to do? If I say that is right then what next?

What is the critical value? The level of significance or the required level of significance?!

Reply 11

Peacey

Sounds like you've done it right, you've just got a more sensitive table of significances than me. "critical value" just means the value that T cannot exceed in the table of significance.

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