Question: A medical researcher believes the number of ear infections in swimmers can be reduced if the swimmers use ear plugs. A sample of ten people was selected, and the number of ear infections for a four-month period was recorded. During the first two months, the swimmers did not use the ear plugs; during the second two months, they did. At the beginning of the second two-month period, each swimmer was examined to make sure that no infections were present. The data are shown below. At Alpha = 0.05, can the researcher conclude that using ear plugs effects the number of ear infections?

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