Choosing a Test and Naming the Populations
For each of the following, state whether a one-proportion z-test or a two-proportion z-test would be appropriate, and name the populations.
a. The minimum quantity of ingredient X in a product is 38% of total weight. A random sample of products manufactured in a factory is examined to see whether the rate of ingredient X in the product is significantly higher than 38%.
b. A student watches a random sample of male and female car drivers parking in a parking lot. Some drivers park the car as they drive in and some park after reversing the car. He wants to compare the proportions of male and female drivers who park the car after reversing.