Medicine A pharmaceutical company conducts an experiment in which a subject takes 100 mg of a substance orally. The researchers measure how many minutes it takes for half of the substance to exit the bloodstream. What kind of variable is the company studying?

Note: Lecture 17 gives example problems for using the probability table for standard normal probabilities Introducing sampling distribution of statistic- Probability model of sample mean, and the central limit theorem: - Fundamental question: How do we measure if a statistic of a study indicates a “real” effect as opposed to a result of random variation o To answer this, we need to look at the sampling distribution – the probability distribution of all possible values of a statistic (from repeated samples of same size from the same population) o The principle: to imagine all possible samples that could have been obtained