- do I have to test if students answer is normally distributed?

You probably have an ordinal scale, so normality isn't an issue.

And with n=10, any normality test has too small statistical

power to be useful. If you sticked to nonparametric tests, you'd

be on the safe side.

- I plan to do one sample t-test for comparing students median and experts median.

t-tests are for means, not for medians. You could do a

Mann-Whitney U-test, although I don't know

whether it is at all possible to reach the usual

p < 0.05 criterion if one of the groups has only

n=2.

With kind regards

K.