he formula for changing a Z score to a raw score is: _____________________. 2. The formula for changing a raw score to a Z score is: _____________________. 3. In a standardized distribution, the mean is always __________ and the standard deviation is always __________. 4. In a normal curve, the percentage of scores between one (Z score 1) and two (Z score 2) standard deviations above the mean is: ________________. 5. In a normal curve, the percentage of scores lower than two standard deviations below the mean (Z Score of -2) is approximately:_______________. 6. Explain the difference between a popu