Three samples of each of three types of PVC pipe of equal wall thickness are tested to failure under three temperature conditions, yielding the results shown below. Research questions: Is mean burst strength affected by temperature and/or by pipe type? Is there a "best" brand of PVC pipe? Explain.

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Burst Strength of PVC Pipes (psi) Temperature PVC1 PVC2 PVC3 250 273 281 321 322 299 358 363 341 301 285 275 342 322 339 375 355 354 235 260 279 302 315 301 328 336 342 Hot (70 C) Warm (40° C) Cool (10° C)