In one study half of a class were instructed to watch exactly 1 hour of television per day, the other half were told to watch 5 hours per day, and then their class grades were compared.

In one study half of a class were instructed to watch exactly 1 hour of television per day, the other half were told to watch 5 hours per day, and then their class grades were compared. In a second study students in a class responded to a questionnaire asking about their television usage and their class grades.

(A) The first study was an experiment without a control group, while the second was an observational study.

(B) The first study was an observational study, while the second was a controlled experiment.

(C) Both studies were controlled experiments.

(D) Both studies were observational studies.

(E) Each study was part controlled experiment and part observational study.

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If you were to select a person at random, what is the probability that they would have an IQ score of 130 or more, assuming the scores are distributed Normally

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Dice are small cubes, held in the hand and then dropped or thrown on a flat surface, as part of a game.

Dice are small cubes, held in the hand and then dropped or thrown on a flat surface, as part of a game. Each surface of a die has a number….

A web manager for a retail merchant tests two different presentations of a product to determine whether there is a difference in the length of time that people stay on that product page.

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