Selections with Replacement When randomly selecting items, if successive selectionsare made with replacement of previously selected items, which of the five rules of this sectionapply: (1) fundamental counting rule; (2) factorial rule; (3) permutations rule (when all itemsare different); (4) permutations rule (when some items are identical to others); (5) combinationsrule?
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