Can you help me answer the first and the secont and could you please tell me about the reason?

1314 You begin any hypothesis test by formulating a null and an alternative hypothesis. The null hypothesis states that the population mean is equal to the initial value. In this problem, the null hypothesis is that the caloric content in the actual population is what Oma's has always advertised. Null Hypothesis Mean 112 Cal Null Hypothesis u = 112 Cal Alternative Hypothesis ? Sample Size (n) 32 m Sample Std. Dev. {5) 19 Cal Confidence Level 99% 1315 The alternative hypothesis should contradict the null hypothesis. For a two- sided test, the alternative hypothesis simply states that the mean does not equal the initial value. A two-sided test is more appropriate in this problem, since Blanche only wants to know if the mean calorie content has changed. Null Hypothesis Mean 112 Cal Null Hypothesis 1: = 112 Cal Alternative Hypothesis 1] s 112 Cal Sample Size (n) Sample Mean (1?) Sample Std. Dev. (5) Confidence Level 1316 You assume that the null hypothesis is true and construct a range of likely sample means around the population mean. Using the data and the appropriate formula, you nd the range [103; 121]. 5 Range=izZ = 112 use '9 117 fa2' =11: : 9 =[103;121] Null Hypothesis Mean 112 Cal Null Hypothesis p = 112 Cal 1- v. ' ||| 131-6 You assume that the null hypothesis is true and construct a range of likely sample means around the population mean. Using the data and the appropriate formula, you find the range [103; 121]. Range = /Itz - S = 112 + 2.58 19 V 32 = 112 + 9 = [103; 121] Null Hypothesis Mean 112 Cal Null Hypothesis H = 112 Cal Alternative Hypothesis p # 112 Cal Sample Size (n) 32 Sample Mean (x) 102 Cal Sample Std. Dev. (s) 19 Cal Confidence Level 79%% 131-7 The sample mean of 102 falls outside of that range, so you can reject the null hypothesis. Blanche can be 99% confident that the population mean is not 112. Range = Witz = 112 + 2.58 19 Vn V 32 = 112 + 9 = [103; 121] Null Hypothesis Mean 112 Cal Null Hypothesis H = 112 Cal Alternative Hypothesis p # 112 Cal Sample Size (n) 32 Sample Mean (X) 102 Cal Sample Std. Dev. (s) 19 Cal Confidence Level 99% Second Question 131-8 ? Why might Blanche have chosen a 99% confidence level rather than the more typical 95% level for her test? A. She is generally risk averse, and wants to minimize the chance of making any type of erroneous decision based on the test. B. She feels that it would be very costly to change her marketing campaign if there is in fact no change in the average number of calories. . She feels that it would be very costly to not change her marketing campaign if there is in fact a change in the average number of calories. Null Hypothesis Mean 112 Cal Null Hypothesis H = 112 Cal