Q. 4 Corn soy blend (C813) is often provided to relief agencies for distribution in refugee camps or as emergency relief. Production of C83 is carefully monitored to ensure that the product has appropriate levels of certain vitamins and minerals for good nutrition. 8 bags of C33 were randomly taken from a large shipment and the amount of vitamin C was measured. The measured concentrations in milligrams of vitamin C per 100 grams of CSB were 26 31 23 22 11 22 14 31 a) Is it plausible that these observations come from a normal distribution? Justify your answer. b) Construct a 95% condence interval for the true mean amount of vitamin C per 100 grams of CSB assuming the population distribution is actually normal. c) Construct a 95% upper bound for the true standard deviation of the amount of vitamin C per 100 grams of CSB assuming the population distribution is actually normal