Felix and Norton is a Canadian gourmet cookie-making company that prides itself in the quality of its service. When producing cookies for its 8-ounce packages, the company randomly tests bags every hour. From its previous testing, it is known that the standard deviation of the weight of the 8-ounce packages is 0.57 ounces. At the bottom of each hour, the quality control manager randomly selects 25 packages from the supply that was produced, and weighs each one of them to ensure that the production is under control. On this given occasion, the mean weight was found to be = 8.20 ounces. Since the bakery stands to lose money when µ > 8 ounces, and the customer loses out when µ < 8, please test the null hypothesis (Ho: µ = 8) against the alternate hypothesis (Ha: µ ≠ 8) at the 99% confidence level. Use: a. The classical approach (graphical method). b. The confidence interval method. c. The probability-value method.
Please help me with these methods