STAT 2 Study Guide - Final Guide: Blind Experiment, Homoscedasticity, Confounding
Document Summary
Salk vaccine trial: they put the children"s whose parents consented into the treatment group and the rest in the control. However, wealthy parents are more likely to consent and wealthy kids are more likely to get polio. The experiment was repeated randomized controlled double blind. Ch 2: observational studies observational study: data is collected without controlling what they do. Association means one thing is linked to the other. Ch 3: the histogram how to draw a histogram convert count to percent. Nd widths, then heights draw axes and label draw bars density: the taller the bar, the more people are in it use density scale on y axis (% per unit) % = area class intervals are ranges for bars discrete histograms have bars centered on value continues histograms (usually) use left endpoint convention. Ch 4: the average and the standard deviation. Roughly guessing the average and sd from a histogram.
