Question

An engineer wants to know if producing metal bars using a new experimental treatment rather than the conventional treatment makes a difference in the tensile strength of the bars​ (the ability to resist tearing when pulled​ lengthwise). At α=0.20, answer parts​ (a) through​ (e). Assume the population variances are equal and the samples are random. If​ convenient, use technology to solve the problem. .

Treatment Tensile strengths (newtons per square millimeter) Experimental 421 372 389 404 383 425 360                       Conventional 424 402 351 371 391 441 394 394 352 420

A) identify the claim and state H₀ and H₀

B) find the critical value and identify the rejection region

C) find the standardized test statistic z,

D) decide whether to reject or fail to reject the null hypothesis

E) interpret the decision in the contest of the original claim

Answer 1

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