In order to compare the satisfaction of customers of 2competitor companies of , 174 customers of company A and 355customers of company B were chosen randomly. Customers wererequired to rate the companies from level 1 (least satisfaction) to5 (maximum satisfaction). The results are included below. Checkwhether the difference in the mean level of customers' satisfactionof the two companies is statistical important at 1%. The resultsare included below:
Company AÂ Â Company B
Sample Size  174  355
Sample mean  3.51  3.24
Sample Standard Deviation (S)Â Â 0.51Â Â 0.52
