results are y1=145, y2=153, y3=150 and y4=147.

(a) State the hypotheses that you think should be tested in this experiment

(b) Test these hypotheses using α

= 0.05. What are your conclusions?

(c) Find the

P-value for the test in part (b).

(d) Construct a 95 percent confidence interval on the mean breaking strength.

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