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

Age in years

20

19

22

23

19

20

21

20

19

20

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