Chapter 10 Day 2

Null Hypothesis The null hypothesis, H 0 (H naught, or the Ho): is a statistical hypothesis that contains an equal sign. It’s the statement being tested in a test of significance. Says that there is “no effect” or “no change” The test of significance is designed to assess the strength of the evidence against the null hypothesis.

Alternative Hypothesis The alternative hypothesis, H a (H sub A or the Ha) contains a statement of inequality such as ≠, This is the effect that we suspect is true, the alternative to the “no effect” or “no change” or the null hypothesis. Before stating the hypotheses, make sure to define what μ represents.

Example 1 Coca Cola claims that their coke bottles contain 2 liters of soda. You feel like they actually contain less because of the air pocket at the top. State the null hypothesis. State the alternative hypothesis.

Example 2 A university publicizes that the proportion of its students who graduate in 4 years is 82% State the null hypothesis. State the alternative hypothesis.

Example 3 A cereal company advertises that the mean weight of the contents of its 20 ounce size cereal boxes is more than 20 ounces. State the null hypothesis. State the alternative hypothesis.

Try on your own… 4. A consumer analyst reports that the mean life of a certain type of automobile battery is not 74 months. 5. A television manufacturer publishes that the variance of the life of a certain type of television is less than A radio station publicizes that it’s proportion of the local listening audience is greater than 39%.