The following graph is a normal probability plot of the blood thiocyanide concentration for the seven rats eating the raw 30% flaxseed diet. Statistical software reports the Shapiro-Wilk's normality test P-value is 0.2675.
(a) Would it be reasonable to regard the population from which these data came as normal? Briefly explain using the graph and Shapiro-Wilk's test P-value to support your answer.
(b) Would it be reasonable to regard the sampling distribution of (for samples of size n = 7) to be normally distributed? Briefly explain.
(c) True or false? If the dots on the normal probability plot fell very closely to the line, we would have good evidence that blood thiocyanide concentration are normally distributed.