Select the studies below that use a matched pairs experimental design.
A study is designed to test which of two new methods is better at teaching children in first grade to read. Children in first grade are selected at random and are paired together based on reading ability. One student is taught with one method, and the other is taught with another method.
A scientist seeks to compare the durability of nitrile gloves against latex gloves. Half of the subjects are randomly assigned to perform the same task using nitrile gloves, and the other half performs the same task using latex gloves.
Participants in a study to determine the effects of a new respiratory medication are divided into groups based on gender. Participants within each group are randomly assigned the treatment or a placebo to compare the results.
A scientist seeks to compare the durability of nitrile gloves against latex gloves. Each subject performs a task wearing nitrile gloves and repeats the same task using latex gloves.
To determine the effect of wearing a seatbelt in a car accident, recent accident reports are collected. The reports are divided into two groups, those who were wearing a seatbelt at the time of the accident and those were were not. The difference of the mean severity for the two groups is computed.