Re: uNL: you are weak-tight.
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Also.. 40 people responded to the first poll, and 24 to the second. So you have a maximum of 24 people who responded to both, and probably more like 10. 10 people... it's hardly statistically damning.
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Since the people are all out of the same population (uNL) The sample size is more the enoufh for statistics. However, OP should give us the standard deviation and I could simply calculate if it is statistically significant.
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yeh you don't need anyone who responded to both - if we did know that we could use a more powerful test (paired t test) but it doesn't matter that we don't.
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