10.76 The study referenced in Exercise 10.75 was actually a 5-year study, with a random sample of 300 respondents per year. The percents of respondents stating that the aerosol dispensers did not spray properly were as follows:

Are there significant differences among these percentages at the 1% level of significance?

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2003 2004 2005 2006 2007 73% 62% 65% 69% 64%