Suppose X has a mound-shaped distribution with sigma=9. A random sample of size 36 has a sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean u?
2 answers
As long as the mound approximates a normal distribution, yes.
Yes, when the sample size is larger than 30, you assume a normal distribution instead of using the student's t distribution.
1 answer