1. What does it mean for something to be considered "statistically significant"? Explain the process involved in proving statistical significance, then give an example.

2. State in a complete sentence the null hypotheses for each of the following:

1. An experiment testing whether Robitussin CF decreases the length of colds.

1. A correlational study on the relationship between brain size and intelligence.

1. An investigation of whether a self-proclaimed psychic can predict the outcome of a coin flip.

1. A study comparing a drug with a placebo on the amount of pain relief using a one-tailed test.