I've conducted a survey for my thesis where I ask a series of questions of the format:

A statement relating to the experiment

Then the participants answer strongly disagree (1) --> strongly agree (5)

I have 14 responses and two groups, one control and one experimental (7) in each. With the answers to each of these questions, I have checked for statistical significance in each question by use of a Z-test, however I was reading this morning that my data may be ordinal and small sample size, in which case I should use a T-test.

Is my initial approach valid still?

  • $\begingroup$ See stats.stackexchange.com/questions/85804/… or stats.stackexchange.com/questions/61284/t-tests-vs-z-tests , but the more general question is if you should use any of those tests with this data. $\endgroup$
    – Tim
    Aug 24, 2017 at 11:19
  • $\begingroup$ Wouldn't fisher's exact test be a better fit here, since your answers are categorical and sample size is small? $\endgroup$ Aug 24, 2017 at 11:25
  • $\begingroup$ I don't understand "one control and one experimental in each". Are you saying that controls and treatments are paired? Or did you randomly assign 14 people to two groups? $\endgroup$
    – Placidia
    Aug 24, 2017 at 11:34
  • $\begingroup$ random assignment of people to two groups, so participants either did the experiment or the control. $\endgroup$ Aug 24, 2017 at 11:36
  • $\begingroup$ Why would ordinal data suggest a t-test? $\endgroup$
    – Glen_b
    Aug 24, 2017 at 12:29


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