Question

2) A random sample of 28 persons with a poison ivy rash were asked to use a

new medication and record the number of days required to completely
eliminate the rash. It is assumed that elimination time is normally
distributed. The results are
X bar= 4.3 days and s = 1.1 days
Can we conclude that the true average elimination time u is less than
5 days?

Answer 1

yes

Explanation:

because the most it takes is 4.3 days