An electronics manufacturing process has a scheduled mean completion time of 70minutes. It is claimed that, under new management, the mean completion time,, is less than70 minutes. To test this claim, a random sample ofcompletion times under new management was taken. The sample had a mean completion time of 68minutes and a standard deviation of 12minutes. Assume that the population of completion times under new management is normally distributed. At the 0.05level of significance, can it be concluded that the mean completion time,, under new management is less than the scheduled mean? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult alist of formulas.)

The null hypothesis: H0: The alternative hypothesis: H1: The type of test statistic: (Choose one)ZtChi squareF The value of the test statistic: (Round to at least three decimal places.) The critical value at thelevel of significance: (Round to at least three decimal places.) At thelevel, can it be concluded that the mean completion time under new management is less than the scheduled mean? Yes No

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