AP Stats Significant Tests

Find the degrees of freedom.

• 4

• 5

• 6

• 7

Which test would you use to see if age is a factor choosing a person’s favorite fruit? 900 college students were surveyed and their favorite fruit recorded.

• Chi-square Goodness of Fit Test

• Correlation coefficient

• Chi-Square Test for Independence

• Chi-square test for correlation

A chi-square test is used to test whether a 0 to 9 spinner is "fair" (that is, the outcomes are all equally likely). The spinner is spun 100 times, and the results are recorded. The degrees of freedom for the test will be

• 8

• 9

• 10

• 99

Using a GDC, the chi-square test statistic for commuter data is χ² = 5.37 with P-value < 0.01. If we useα=0.05, what conclusion is appropriate?

• Do NOT reject H0; the results are significantly different.

• Do NOT reject H₀; the results are not significantly different.

• Reject H_0; the results are significantly different

• Reject H0; the results are not significant different.

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

• Significance Level

• Significance Test

• Confidence Interval

• Confidence Level

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

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

• Descriptive

• Inferential

• Parametric

• Non Parametric

• A

• B

• C

• D

• E

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

• Validity

• Random Sample

• Sample

• Inferential Statistic

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

• Descriptive Statistics

• Inferential Statistics