Hello! I hope it's okay to ask stats questions...(adsbygoogle = window.adsbygoogle || []).push({});

I think the calculations are correct, but I would appreciate it if someone could check for me!

These are the results from the exp. using repeated measures. My hypothesis is that the reuslts in condition 2 should be less than condition 1.

Cond 1

49

41

42

44

44

42

66

57

44

66

66

59

Cond 2

43

39

36

42

48

41

38

44

34

40

32

43

I know working out the standard deviation is tedious, but I checked with excel and it matched (I used n-1, so I got the population, not just the sample).

So, for condition 1:

mean=51.66666667

s.d.= 10.36895132

standard error= 2.99325842

and condition 2:

mean= 40

s.d.= 4.51260859854

standard error= 1.30267789

These (I think) are correct, its the t-test, p value and effect size I would greatly appreciate some feedback for.

For the t-test I used the realted t-test, since its repeated measures (same participant in both):

I got t= 3.346118674

are the units sd?

and DoF would be 11, and since I specified a direction, I got p=0.003261139 (one-tailed); which is significant? since P is less than 0.05?

and for effect size:

I got (d)= 1.567935986

Can somone verify the t-test, effect size and p value for me? Please! I used fractions at some points where I could quickly get the data (I wrote it down), in ideal circumstances should I use fractions for all the 'inputs' (e.g. stand. dev of difference, etc.), if possible, since its more 'accurate'?

Thanks! I now it's a lot to ask, but I would geratly appreciate it! I realise the formuale are slightly different depending on the narue of the experiment, I think I chose the right ones!

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# Homework Help: T-test and effect size

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