Business stats

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 = 0.05, answer parts (a) through (e). Assume the population variances are equal and the samples are random, If convenient, use technology to solve the problem. Treatment Tensile strengths (newtons per square millimeter) Experimental | 430 443 430 361 393 417 443 Conventional 405 394 407 374 417 404 425 351 438 353 The alternative hypothesis, Ha O The null hypothesis, Ho (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 - to to O C. t to (c) Find the standardized test statistic. 1= (Type an integer or decimal rounded to the nearest thousandth as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. the null hypothesis. (e) Interpret the decision in the context of the original claim. At the 5% significance level, enough evidence to support the claim. Next