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You have heard that some less-expensive tennis balls have a smaller diameter than other tennis balls so you decide to measure the average diameter in a sample of 30 Penn, 30 Wilson, and 30 Champion tennis balls. You are interested in whether the average diameter is significantly different.

What is the alternative hypothesis?


There is no difference in average diameter among the population of the three brands.


All the brands have the same average population diameter.


All the population mean diameters are different.


At least one population mean diameter is different from another.

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