The average Senior High School annual cost of tuition fee for all private schools in Cavite last year was 46,300 a random sample of costs this year for 45 private schools indicated that the sample mean was 47,800 and a sample standard deviation was 5600 at the 0.10 level of significance, is there sufficient evidence to conclude that the cost has increased? Solution: 1. State of hypotheses 2. The level of significance, critical region, and df if any 3. Compute for the value of one sample z-test or t-test 4. Decision rule 5. conclusion