The rejection rule is
A)reject the null hypothesis in favor of the alternative hypothesis
B)fail to reject the null and conclude that the product meets specifications.
C)inadequate sample size and hence conduct a retest.
D)standard deviation of the sample to be calculated.
Use the following information for questions 12 through 14.
Jack Enterprises Inc.is a laser printer manufacturer.The board of Jack Enterprises wants to see a perceptible improvement in the quality of the laser printers and specify a defect free production rate of 0.95.The quality assurance manager incorporates some
Changes in the assembling process and checks a random sample of 225 printers.She finds that only 87% of the printers are defect free.She wants to test the hypothesis that 95% of the printers manufactured by the company are defect free.The significance level
Has been specified at 0.05.

Question

Quizplus · Accepted Answer

The quality assurance manager wants to test whether the proportion of defect-free printers has improved to meet the board's specification of 0.95. This is a hypothesis test with the null hypothesis being that p (proportion of defect-free printers) = 0.95 and the alternative hypothesis being that p < 0.95 (since the manager wants to see an improvement). The manager then tests the null hypothesis using a random sample of 225 printers and finds that only 87% are defect-free. Based on this sample, the manager should reject the null hypothesis in favor of the alternative hypothesis since the sample proportion is significantly lower than the hypothesized proportion. A significance level of 0.05 indicates that there is a 5% chance of rejecting the null hypothesis when it is actually true.

The Rejection Rule Is