Which test should I use for a within-design with only one measuring point/time?

#1
Hi,

I will lay out the experiment I am analyzing shorty and a little bit simplified:

Participants were asked to debate a topic with an experimenter. The participant's debating strategies were observed and scored. For example, every participant obtained a score for "negative strategies" (NS) and "positive strategies" (PS). The scores are the duration of time the participant spent using that strategy, in relation to total time of the discussion (= percentage; scores could range from 0 to 1). In total, 5 different strategies were coded and all of them were mutually exclusive.

I now want to investigate if participants, who scored higher in anxiety (questionnaire), are using higher rates of NS than participants with lower scores in anxiety.
Which test could I use for this? The sample is not clinical, so there are no groups of "non-anxious" vs. "anxious". My sample size is small (N=28) - should I split the sample by anxiety median and then calculate differences between the groups? Or can I just simply use a regression?

I apologize because this is probably a very basic question but I am a little bit lost (also I am not an English native speaker, so sorry about that too). I would be very happy to get some answers or ideas! Thank you in advance.
 

Karabiner

TS Contributor
#2
Do not split the anxiety score, that would be nonsense. You can correlate the NS-rate with the anxiety score, using Pearson's r or Spearman's rho.
In addition, make a scatteplot with NS-rate vs. anxiety score, in order to obtain a visual impression of the association.

With kind regards

Karabiner
 
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