Module 8: UNDERSTANDING THE Z-SCORE 1. Which of the following is the best formula in calculating the z-score for the population data? a. z = b. z = k-x C. Z = =x d. z = X- 2. Which of the following is the best formula in calculating the z-score for the sample data? a. z = X-& b . z= X-X C. Z d. z = K- 3. Given: X = 50, x = 35 and s = 5, find the z-score value. a. 4 b. 3 c. 2 d. 1 4. Which of the following is the z-score value of X = 89, # = 92 and a = 6? a. -1 b. -0.6 C. -0.5 d. 0.5 5. If z = -0.5, # = 79 and a = 5, what is the corresponding random variable X? a. 86.5 b. 85.6 c. 79.5 d. 76.5SP2.1 If u = 79 and o = 5, find the corresponding random variable X -2 -1 0 1 N W 6) 69 7) 8) 84 89 9) 6. a.54 b. 59 C. 64 d. 69 7. a. 64 b. 74 c. 84 d. 94 8. a. 69 b. 79 c. 89 d. 99 9. a. 64 b. 74 C. 84 d. 94 10. What is the value of a? -3 -2 -1 1 2 W 36 39 42 45 48 51 54 10. a. 1 b. 3 c. 5 d. 7 Module 9: THE PROBABILITIES AND PERCENTILES UNDER THE NORMAL CURVE Compute for the probabilities/percentiles of the following areas using the standard normal table. 1. the area less than z = 0 a. 25% b. 50% c. 75% d. 100% 2. the area above z = 1.55 a. 6.06% b. 7.07% C. 8.08% d. 9.09% 3. the area in between z = -2 and z = -1.09 a. 11.01% b. 11.21% c. 11.31% d. 11.51% 4. the 55th percentile of the distribution a. above z = 0.025 b. below z = 0.025 c. above z = 1.025 d. below z = 1.025 7