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Concrete Strength An engineer wants to know if the mean
Chapter 1, Problem 25AYU(choose chapter or problem)
An engineer wants to know if the mean strengths of three different concrete mix designs differ significantly. He randomly selects 9 cylinders that measure 6 inches in diameter and 12 inches in height in which mixture 67-0-301 is poured, 9 cylinders of mixture 67-0-400, and 9 cylinders of mixture 67-0-353. After 28 days, he measures the strength (in pounds per square inch) of the cylinders. The results are presented in the following table:
(a) State the null and alternative hypotheses.
(b) Explain why we cannot use one-way ANOVA to test these hypotheses.
Questions & Answers
QUESTION:
An engineer wants to know if the mean strengths of three different concrete mix designs differ significantly. He randomly selects 9 cylinders that measure 6 inches in diameter and 12 inches in height in which mixture 67-0-301 is poured, 9 cylinders of mixture 67-0-400, and 9 cylinders of mixture 67-0-353. After 28 days, he measures the strength (in pounds per square inch) of the cylinders. The results are presented in the following table:
(a) State the null and alternative hypotheses.
(b) Explain why we cannot use one-way ANOVA to test these hypotheses.
ANSWER:Step 1 of 3
Given,
Three types of concrete mixture i.e, 67-0-301, 67-0-400, 67-0-353 and their height and diameter.