The polling organization Ipsos conducted telephone surveys inMarch of 2004, 2005 and 2006. In each year, 1001 people age 18 orolder were asked about whether they planned to use a credit card topay federal income taxes that year. The data are given in theaccompanying table. Is there evidence that the proportion fallingin the three credit card response categories is not the same forall three years? Test the relevant hypotheses using a .05significance level. (Use 2 decimal places.)
| Intent to Pay Taxes with a CreditCard |
| 2004 | 2005 | 2006 |
Definitely/Probably Will
Might/Might Not/Probably Not
Definitely Not | 42
163
782 | 45
180
777 | 42
190
780 |
?2 =
P-value interval
p < 0.0010.001 ? p <0.01 0.01 ? p < 0.050.05 ?p < 0.10p ? 0.10
