Question: Strong chairs? A company that manufactures classroom chairs for high school students claims that the mean breaking strength of the chairs that they make is 300 pounds. One of the chairs collapsed beneath a 220-pound student last week. You wonder whether the manufacturer is exaggerating the breaking strength of the chairs.
(a) State appropriate null and alternative hypotheses in this setting. Be sure to define your parameter.
(b) Describe a Type I error and a Type II error in this setting, and give the consequences of each.
(c) Would you recommend a significance level of 0.01, 0.05, or 0.10 for this test? Justify your choice.
(d) The power of the test to detect μ = 294 using a = 0.05 is 0.71. Interpret this value in context.
(e) Explain two ways that you could increase the power of the test from (d).