Are the following statements true or false? Explain your reasoning.
a. "If we see a standardized z-value beyond 63, the variable cannot be normally distributed."
b. "If X and Y are two normally distributed random variables measured in different units (e.g., X is in pounds and Y is in kilograms), then it is not meaningful to compare the standardized z-values."
c. "Two machines fill 2-liter soft drink bottles by using a similar process. Machine A has μ = 1,990 ml and σ = 5 ml while Machine B has μ = 1,995 ml and σ = 3 ml. The variables cannot both be normally distributed since they have different standard deviations."