58. A certain pen has been designed so that true average writing lifetime under controlled conditions (involving
Question:
58. A certain pen has been designed so that true average writing lifetime under controlled conditions (involving the use of a writing machine) is at least 10 hours. A random sample of 18 pens is selected, the writing lifetime of each is determined, and a normal probability plot of the resulting data supports the use of a one-sample t test.
a. What hypotheses should be tested if the investigators believe a priori that the design specification has been satisfied?
b. What conclusion is appropriate if the hypotheses of part
(a) are tested, t 2.3, and .05?
c. What conclusion is appropriate if the hypotheses of part
(a) are tested, t 1.8, and .01?
d. What should be concluded if the hypotheses of part (a)
are tested and t 3.6?
Step by Step Answer:
Probability And Statistics For Engineering And The Sciences
ISBN: 9781111802325
7th Edition
Authors: Dave Ellis, Jay L Devore