3. A researcher studies the factors that determine how many children couples decide to have. The variable, number of children, is a (discrete/continuous) variable. (Pick either discrete or continuous). (1pt) 4. An investigator studies how sustained attention is related to reaction time. Reaction time (measured in seconds) is a (discrete/continuous) variable. (Pick either discrete or continuous). (1pt) 5. A researcher is interested in the effects of humidity on the eating behavior of rats. A group of 25 rats is housed in a controlled environment and the researcher measures the amount of food consumed by each rat with the humidity set at 20% and again with the humidity set at 80%. For this study (1pt): 1. The population is: 2. The sample is:.