Strand a Activity 9: Solve what is asked completely. Follow the steps from the examples. on page 16. A. Find the critical value Za/2 that corresponds to the given confidence level. Use the z-table 1. 98% 2. 92% 3. 96% 4. 94% Page | 52B. Find the 90% confidence interval of a population mean for the given values below 1. x= 56, n= 49, 0= 0.8 Step 1. find the value of Za/2 Step 2. Find o and E. Step 3. Find the confidence interval X - E