4. The average number of years to finish basic education is 14. A sample of 30 senior high school students were asked and found out that the mean number of years to finish their basic education is 12 with a standard deviation of 2 years. Test the hypothesis at 93% condence interval that the average number of years to finish basic education is less than 14 years. A. 3:0.025 B. 3:001 c. 3:010 D. 3:007 2 2 2 2