At the 0.05 level of significance, what conclusion can be drawn, ...

[jho37]

At the 0.05 level of significance, what conclusion can be drawn, from the hypothesis test, about the quality improvement in the Scullia Auto Company?
 
  What will be an ideal response?

Question 2

A 95 confidence interval estimate for the difference between two population means, 1 - 2, is determined to be 62.75 < 1 - 2 < 68.52. Which of the following is true if the confidence level is reduced to 90?
 
  A) The confidence interval becomes wider.
  B) The confidence interval remains the same.
  C) The confidence interval becomes narrower.
  D) More information is required to determine the answer.

[Fayaz00962]

Answer to Question 1

Since p-value = 0.0087 < 0.05, reject H0. There is enough statistical evidence to conclude that there is a significant improvement in the quality of the steel.

Answer to Question 2

C