AP Stats Hypothesis Tests

A random sample of traffic tickets given to motorists in a large city is examined. The tickets are classified according to the race of the driver. The results are summarized in the table provided. Assuming H₀ is true, the expected number of Hispanic drivers who would receive a ticket is

• 10.4

• 11

• 11.8

• 12

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

Which test would you use to see whether the fans that buy tickets are demographically the same as the general population of the city. Currently 42% are Caucasian, 35% are Latinx, 12% are African American, 8% are Asian, and the rest are defined as other.

• Chi-square Goodness of Fit Test

• Chi-Square Test for Independence/Association

• Not a Chi-square test

• B
• C
• D
• E

• B
• C
• D
• E

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.

The bigger the chi square statistic, the ________ the p value.

• bigger

• smaller

What are the degrees of freedom for the following χ² test?

• 6

• 2

• 5

• 36