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Three Randomly Chosen Pieces of Four Types of PVC Pipe

question 75

Multiple Choice

Three randomly chosen pieces of four types of PVC pipe of equal wall thickness are tested to determine the burst strength (in pounds per square inch) under three temperature conditions, yielding the results shown below.  Temperature  PVC1  PVC2  PVC3  PVC4 250301235217 Hot (70∘C) 273285260255281275279241321342302240 Warm (40∘C) 322322315260299339301278358375328301 Cold (10∘C) 363355336333341354342302\begin{array} { | c | c | c | c |c | } \hline{ \text { Temperature } } & \text { PVC1 } & \text { PVC2 } & \text { PVC3 } & \text { PVC4 } \\\hline& 250 & 301 & 235 & 217 \\\text { Hot } \left( 70 ^ { \circ } \mathrm { C } \right) & 273 & 285 & 260 & 255 \\& 281 & 275 & 279 & 241 \\ \hline& 321 & 342 & 302 & 240 \\ { \text { Warm } \left( 40 ^ { \circ } \mathrm { C } \right) } & 322 & 322 & 315 & 260 \\& 299 & 339 & 301 & 278 \\\hline & 358 & 375 & 328 & 301 \\\text { Cold } \left( 10 ^ { \circ } \mathrm { C } \right) & 363 & 355 & 336 & 333 \\& 341 & 354 & 342 & 302 \\\hline\end{array} Which test would be appropriate?

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