For a particular consumer product, the mean dollar sales per retail outlet last year in a sample of n1 = 10 stores was = $3,425 with s1 = $200. For a second product the mean dollar sales per outlet in...

For a particular consumer product, the mean dollar sales per retail outlet last year in a sample of n1 = 10 stores was= $3,425 with s1 = $200. For a second product the mean dollar sales per outlet in a sample of n2 = 12stores was= $3,250 with s2 = $175. The sales amounts per outlet are assumed to be normally distributed for both products. Estimate the difference between the mean level of sales per outlet last year using a 95 percent confidence interval.