The Tessy’s Restaurant has been averaging sales of 50 lunch packets per day. Because of the construction of new office complexes, it expects to increase the sale. During the first 11 days after the...

The Tessy’s Restaurant has been averaging sales of 50 lunch packets per day. Because of the construction of new office complexes, it expects to increase the sale. During the first 11 days after the occupation of their complexes, the daily sales were: 49, 55, 56, 45, 58, 54, 58, 49, 54, 53 and 52.

i.                 Test the hypothesis that the sales have increased at the 0.01 level of significance.

ii.               Then write a 99% confidence interval estimate of the mean