Could the Following Sample Reasonably Have Been Drawn from a Normal

Multiple Choice

Could the following sample reasonably have been drawn from a normal population with a mean of 20 and standard deviation of 1.5 using a = 0.01 2 tail ? X : 21, 21, 21, 20, 22, 20, 22?

A) yes
B) no
C) cannot be tested with z test
D) The correct answer cannot be determined from the information provided.