Formulate the null and alternative hypothesis for the following. 1. The school principal surveyed 150 teachers to find out if the salary significantly increased over the past 10 years Ho - There is no significant increase in the salary of teachers for the past 10 years. Ha - There is a significant increase in the salary of teachers for the past 10 years. 2. A school owner wants to find out if male students perform better in Mathematics compared to female. Ho - Ha 3. The president of a university wants to find out if there is enough evidence on the claim of the Dean of the College of Fine Arts that 85% of the students finish their degree in 4 years. Ho. Ha. 4. An economist wants to find out there is difference in the monthly expenses of families from Makati and Quezon City. Ho. Ha. 5. The scholarship committee head wants to determine if the Grade Point Average (GPA) of the scholars decreases during their last year in college. Ho. Ha. 6. A survey found out that in a sample of 200 bank employees, 43 owned cars. A survey-conducted 10 years ago found out that in a sample of 100 families, 20 owned cars. Has the proportion of cars owners changed significantly over the 10-year period? Ho. Ha. 7. A faculty development committee chair wants to find out if the in-service training they organized contributed in the improvement of teacher's performance. Ho. Ha. 8. The owner of LED bulbs is interested in determining whether difference exists in the average sales for the four brands of bulbs. Ho. Ha