1.The manager of an appliance store, after noting that the average daily sales was only 12 units, decided to adopt a new marketing strategy.Daily sales under this strategy were recorded for 90 days after which period the average was found to be 15 units with a s.d. of 6 units.Does this indicate that the new marketing strategy increased the daily sales?Assume that the distribution of daily sales are approximately normally distributed. Use = .01.