Question: An engineer wants to compare the tensile strengths of steel bars that are produced using a conventional method and an experimental method. (The tensile strength of a metal is a measure of its ability to resist tearing when pulled lengthwise,) To do so, the engineer randomly selects steel bars that are manufactured using each method and records the following tensile strengths in newtons per square millimeter.

Experimental

Group 395 389 421 394 407 411389 402 422

416 402 408 400 386 411 405 389

Conventional

Group 362 352 380 382 413 384 400 378 419

379 384 388 372 383

At a =.05, can the engineer claim that the 2 methods produce the same mean tensile strength?

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