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Category > Management Posted 24 Oct 2017 My Price 2.00

strain amplitude

An article reports on a study using high temperature strain gages to measure the total strain amplitude of three different types of cast iron [spheroidal graphite (S), compacted graphite (C), and gray (G)] for use in disc brakes.4 Nine measurements from each type were taken and the results (multiplied by 10,000) are in FatigueThermal.txt. The scientific question is whether the total strain amplitude properties of the different types of cast iron differ.

(a) State the relevant null and alternative hypotheses for answering this question.

(b) Import the data into the R data frame tf and use the R command kruskal.test( tf$values∼tf$ind) to conduct the the Kruskal-Wallis procedure for testing the equality of the three populations. State the p-value and whether or not the null hypothesis is rejected at level 0.05.

(c) On the basis of the test outcome in part (b), is there a need to conduct multiple comparisons to determine which pairs of populations differ at experiment-wise level of significance 0.05? Justify your answer.

 

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Maurice Tutor
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Status NEW Posted 24 Oct 2017 08:10 PM My Price 2.00

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