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Example 145

 

Example 145 Randy Stinchfield of the University of Minnesota studied the gambling activities of public school students in 1992 and 1998 (Journal of Gambling Studies, Winter 2001).  His results are reported below.   Form a 99% confidence interval to estimate the true difference between the proportion of public school students who gambled in 1992 and 1998.   Does there seem to be a difference?

 

1992

1998

Survey n

21,484

23,199

Number who gambled

4,684

5,313

Proportion who gambled

.218

.229

 

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