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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 a = 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 419 382 402 413 377 350 436 Conventional | 411 427 434 438 428 351 369 353 418 402 (a) Identify the claim and state Ho and Ha- The claim is "The new treatment in the tensile strength of the bars." What are Ho and Ha? The null hypothesis, Ho, is H1 = H2 . The alternative hypothesis, Ha, is |H1 # H2 Which hypothesis is the claim? The null hypothesis, Ho O The alternative hypothesis, Ha (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below. (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.) Select the correct rejection region(s) below. O A. t to O B. t> to O c. t