I have a simple random sample of size 40 which talks about no. of newspapers being sold by a particular salesboy each day. Population standard deviation is not know.
I did a normality test on this data and Anderson-darling test rejected the null hypothesis (owing to a few outliers on the right end of the curve)
So, to calculate the confidence interval, can I use t-distribution for this? If not, what other methods can be used for the confidence interval calculation?
Edit: Sorry for not specifying this earlier, I would like to calculate the confidence interval for the estimate of mean number of newspapers sold.