A software company markets a new computer game with two experimental packaging designs. Design 1 is sent to 11 stores; their average sales the first month is 52 nits with sample standard deviation 12 units. Design 2 is sent to 6 stores; their average sales the first month is 46 units with sample standard deviation 10 units. (2.1) Construct a point estimate and a 95% confidence interval for the difference in average monthly sales between the two package designs. (2.2) Concerning the mean sales per month for the same computer game but sold with two package designs. Test at the 1% level of significance whether the data provide sufficient evidence conclude that the mean sales per mouth of the two designs are different. Use the critical value approach. (3.3) Perform the test by using the p value approach.