Without knowing which of the populations is represented, an element is randomly chosen. After viewing the element, the chooser must guess the population from which it came. Thoughts on multiple choice statistics questions. Bring colored pencil to highlight key words and phrases. After deciding on an answer choice, glance at the highlighted words and phrases to make sure you haven't made a careless mistake or an incorrect assumption.
Careless mistakes hurt.
You don't have to answer all of the questions to get a good overall score. For example, suppose one set of test scores has a mean of 80, and another set of scores on the same test has a mean of 90. If the two sets are combined, what is the mean of the combined scores. Just read carefully, and use the highlighting technique previously mentioned. If you can eliminate one or more of the answer choices, you should respond, even if you have to guess from the remaining choices.