If 26 of 200 tires of brand A failed to last 30,000 miles,whereas the corresponding figures for 200 tires of brands B, C, and D were 23, 15, and 32, test the null hypothe-sis that there is no difference in the durability of the four kinds of tires at the 0.05 level of significance.

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A: The sample proportions are omputed as follows,

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Q: Claim: Fewer than 93% of adults have a cell phone. In a reputable poll of 1157 adults, 84% said that…

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