A national freight delivery service is considering introducing a same-day delivery service at no extra cost. It randomly selected customers in its business areas and recorded the customer satisfaction scores. The score range is between 1-100, where 100 is the highest customer satisfaction. Dene X1 as the satisfaction score with ordinary deliveries and X2 as the satisfaction score for the same customers with same day deliveries. Some summary statistics are given as The sample mean of X1 is 44.20 The sample variance of X1 is 142.75 The sample mean of X2 is 53.86 The sample variance of X2 is 103.39 The sample covariance between _ 81.43 X1 and X2 IS The sample size is If you were to carry out a test to investigate whether outsourcing may improve customer satisfaction, what would your sample size be