A business owner would like to know if the new marketing strategy improves their sales. They recorded their average income befor
e and after they change their strategy. Before, they have an average income per month of $ 100,098 with a standard deviation of $ 64, 090. Now, they computed their monthly average of $ 102,190 with a standard deviation of $ 55, 976.Use n= 30 and Test the claim that there is a significant increase of their income due to their new marketing strategy using 0.05 level of significance.
