Speeds of cars were measured as they passed one point on a r…

Speeds of cars were measured as they passed one point on a road to study whether traffic speed controls were needed.​ Here’s a histogram and boxplot of the measured speeds. Accurate statements about this distribution include which of the following: I. The distribution is fairly symmetric. II. The distribution is right skewed with a large outlier. III. A normal probability plot would add information about the normality of the data set.

A researcher is conducting a study on Internet use. He decid…

A researcher is conducting a study on Internet use. He decides to first categorize the population by education level​ (high school, college​ graduate, advanced​ degree, etc.) and then survey a select number from each category. What is this sampling strategy​ called?