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 alphaequals0.05, answer parts (a) through (e). Assume the population variances are equal and the samples are random. If convenient, use technology to solve the problem. Experimental Treatment Conventional Treatment 357 378 424 378 401 383 424 419 362 420 358 402 441 447 387 392 385 Enter the critical value(s) below. negative 2.131 comma 2.131 (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.) Part 5 Select the correct rejection region(s) below. A.negative t 0 less than t less than t 0 negative t 0 less than t less than t 0 B.t less than minus t 0 t less than minus t 0 C.t greater than t 0 t greater than t 0 D.t less than minus t 0 comma t greater than t 0 t less than minus t 0 comma t greater than t 0