M&Ms The Masterfoods company says that before the introduction of purple, yellow candies made up 20% of their plain M&Ms, red another 20%, and orange, blue, and green each made up 10%. The rest were brown. a) If you pick an M&M at random, what was the probability that 1) it is brown? 2) it is yellow or orange? 3) it is not green? 4) it is striped? b) If you pick three M&Ms in a row, what is the probability that 1) they are all brown? 2) the third one is the first one thats red? 3) none are yellow? 4) at least one is green?

Lecture 4: Gathering Useful Data for Examining Relationships 6.1 Speaking the Language of Research Studies Definitions: - Observational Studies: The researchers simply observe or measure the participants (about opinions, behaviors, or outcomes) and do not assign any treatments or conditions. Participants are not asked to do anything differently. - Experiments: The researchers manipulate something and measure the effect of the manipulation on some outcome of interest. Often participants are randomly assigned to the various conditions or treatments. Most studies, either observational or experimental, are