Statistics II - Old Questions

7. Previous literature has reported that the average age of B.Sc. CSIT enrolling students in Tribhuvan University is 22 years. A researcher has doubts on this information and he feels that the average age to be less than 22 years. In order to examine this, the following sample data were collected randomly from the enrolling students of CSIT.

Set up null and alternative hypothesis and test whether the researcher doubt will be justified. Use 5% level of significance. Assume that the parent population from which samples are drawn, is normally distributed.