EXERCISE 2 An investigator tests a claim that vitamin C reduces the severity of common colds. To eliminate the variability due to difference environments, children from the same family are randomly assigned to either a treatment group that receives vitamin C or a control group that receives an inert pill (placebo). Each child estimates, on a 10-point scale, the severity of their colds during the school year. Use t-test at the .05 level of significance. Pair of siblings 1 Vit. C Placebo 2 3 234567899 5 4 7 9 0 3 3 5 7 7 4 6 5 8 1 2 10 3 5