AP Stats Significance Tests

The average miles on a tank of gas for the Ford Explorer is 300 miles with a standard deviation of 22 miles. A consumer group feels the average is actually lower. They survey 40 vehicles and find the average miles per tank is 290 miles. At α = 0.05, test the consumer groups’ claim that the miles per tank is actually lower than 300 miles.

• There is enough evidence to reject the claim

• There is not enough evidence to reject the claim

• There is enough evidence to support the claim

• There is not enough evidence to support the claim

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Statistics which is concerned with a higher order of critical thinking and judgment.

• Descriptive

• Inferential

• Parametric

• Non Parametric

To determine property taxes, Florida reappraises real estate every year, and the county appraiser's website lists the current "fair market value" of each piece of property. Property usually sells for somewhat more than the appraised market value. We collected data on the appraised market values x and the actual selling prices y (in thousands of dollars) of a random sample of 16 condominium units in Florida. We checked that the conditions for inference about the slope of the population regression line are met. Here is part of the Minitab output from a least-squares regression analysis using these data. The equation of the least-squares regression line for predicting selling price from appraised value is

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A procedure using a sample statistic to make a decision about the validity of a claim.

• Significance Level

• Significance Test

• Confidence Interval

• Confidence Level

A prediction has been made that the chance that a person will be robbed in a certain city is 15%.

• Descriptive Statistics

• Inferential Statistics

The process of drawing conclusions using valid data from samples and making generalizations about a population.

• Validity

• Random Sample

• Sample

• Inferential Statistic