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=0.10, 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 392 445 397 449 389 440 376 conventional 354 357 385 354 364 394 404 391 438 443 (a) identify the claim and state h₀ and hₐ. the claim is \the new treatment in the tensile strength of the bars.\

Explanation:

The engineer is testing if the new experimental treatment differs from the conventional one in tensile strength. The claim is about a difference, so the blank should be "makes a difference" as the hypothesis is testing for a difference (not a specific direction like more or less yet, just a difference).

Answer:

makes a difference