Chi-Square Test: Distribution of Licenced Drivers
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Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25.
a. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were aged 25 or younger. Is the age distribution for this sample significantly different from the distribution for the population of licensed drivers? Use alpha = .05.
b. In a sample of n=60 people who recently received parking tickets, 43 were older than 25 years and the other 17 were age 25 or younger. Is the age distribution for this sample significantly different from the distribution for the population of licensed drivers? Use alpha = .05.Same as above only the observed frequencies changed.
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Solution Summary
This solution provides the step by step methodology for the calculations of a chi square test for the goodness of fit. Formula for the calculations and an interpretation of the results are also included. Two files are also attached: A Word document contains the full solution and an Excel spreadsheet presents the Chi-square test calculations.
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