The manufacturer of MP3 player wanted to know whether 10 percent reduction in price is enough to raise the sales of the product. To investigate, the owner randomly chosen eight outlets and sold the MP3 player at reduced price. At seven randomly chosen outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at sampled outlets.
Regular Price Reduced Price
138 128
121 134
88 152
115 135
141 114
125 106
96 112
- 120
Develop separate 99% confidence interval estimates of the mean number of sales at regular price and at the reduced price.