Question: Variable description

ThisyearSales: Annual sales of retail stores with advertising on cable channels

LastyearSales: Annual sales of retail stores without advertising on cable channels

Cable television has allowed local retail stores to advertise on certain cable channels. A random sample of 40 retail stores that advertised this year but did not advertise last year was selected. The annual sales were recorded in units of thousands of dollars under the variable names ThisyearSales and LastyearSales.

Is there enough evidence to infer at the 5% significance level that the mean sales from this year is greater than the mean sales for last year for retail stores that started advertising on cable this year?

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