When testing a hypothesis about a population mean if a rando

When testing a hypothesis about a population mean, if a random sample size greater than 30 then...

a)It can be assumed that the sample came from a normal distrubtion

b)It can be assumed the sampling distributino of the sample means is a normal distrbution

c)Both a and b

Solution

(A) is wrong, we dont know about population. But (B) is correct due to central limit theorem.