Learning goals: Teacher Facing Calculate and interpret (orally and in writing) the mean absolute deviation of a sample. Generalize that an estimate for the center of a population distribution is more likely to be accurate when it is based on a random sample with less variability. Use the mean of a random sample to make inferences about the population, and explain (orally and in writing) the reasoning. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.8 Probability and Sampling, Grade 7.