Complete the steps needed in solving the z test of the given statement. For Step 3: z computed, no need to show your solution, answer only, and for Step 4: Decision rule, no need to draw for the graph of the normal curve, just indicate whether the null hypothesis will be rejected or not. Average Senior High School annual cost of tuition fee for all private schools last year was P46,300. A randomn sample of costs this year for 45 private schools indicated that the sample mean was P47,800 and a sample standard deviation was P5,600. At the 0.10 level of significance, is there sufficient evidence to conclude that the cost has increased? Solution: Step 1: State the hypotheses. H0= H1= Step 2: The level of significance and critical region. a = Step 3: Compute for the value of one sample z test. Zcomputed =. Step 4: Decision rule. and Zeritical = Step 5: Conclusion