A market researcher wants to compare market prices for the same product made by several popular manufacturers. A random sample has been generated for the product of each manufactory. The information is presented in the table below. 
Carry out multiple comparison procedure and interpret the results using 95% Tukey-Kramer confidence interval.
A) The mean prices for the manufactories A and B differ from the prices for the manufactories C and D.
B) The mean price for the manufactory B differs from the mean prices for the manufactories C and D, the mean price for the manufactory A differs from the mean price for the manufactory D.
C) The mean price for the manufactory B differs from the mean prices for the manufactories C and D.
D) The mean price for the manufactory B differs from the mean price for the manufactory D.
Correct Answer:
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