# Alg2.7 Statistical Inferences

In grade 7, students examined processes for collecting samples from a population and using information from the samples to estimate characteristics for the population. In this unit, students expand on this idea by exploring the normal distribution and applying their understanding of the distribution to provide estimates with a margin of error. The unit also examines experimental studies, observational studies, and surveys. For experimental studies, it examines methods for analyzing the data using a randomization distribution and modeling the data with normal distributions. The importance of random selection for gathering a sample for surveys and observational studies and the importance of random assignment in experimental studies is emphasized. The unit concludes with ways to analyze the results from the various study types. Data from surveys and observational studies using random samples are used to estimate population means and proportions with a margin of error.