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.

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

If you look at the scores on most IQ tests, they have a mean of 100 and a standard deviation of 15. For class discussion: (a) Why do you think….

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.

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….