Before changes to its management staff, an automobile assembly line operation had a scheduled mean completion time of 12.6 minutes. The standard deviation of completion times was 1.4 minutes. An analyst at the company suspects that, under new management, the mean completion time, , is now less than 12.6 minutes. To test this claim, a random sample of 10 completion times under new management was taken by the analyst. The sample had a mean 12.5 minutes. Assume that the population is normally distributed. Can we support, at the 0.10 level of significance, the claim that the population mean completion time under new management is less than 12.6 minutes? Assume that the population standard deviation of completion times has not changed under management. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H 0 and the alternative hypothesis H 1 . H 0 : H 1 : (b) Determine the type of test statistic to use. (c) Find the value of the test statistic. (Round to three or more decimal places.) (d) Find the p -value. (Round to three or more decimal places.) (e) Can we support the claim that the population mean completion time under new management is less than 12.6 minutes? Yes No
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Including Mental Health Support in Project Delivery, 14 May.pdf
Before the Opportunity Rover went dead- it collected organic material.docx
1. Before the Opportunity Rover went dead, it collected organic material from Mars and returned it
to Earth for analysis. You perform an experiment in which nuclear material (chromatin) is
isolated from what appears to be Martian cells. You briefly digest with micrococcal nuclease
which cuts accessible DNA. Any proteins are then removed and the resulting purified DNA is
analyzed by gel electrophoresis. You observe a collection of DNA fragments (black bars) that
are multiples of 410 base pairs in length (i.e., 410 bp , 820 bp , 1230 bp , 1640 bp . and so forth).
What can you conclude about the organization of DNA and protein in the Martian sample? (Why
410 and why muliples fo 410 ) Suppose you perform an experiment in which the chromatin is
digested for a mugh longer period of time with micrococcal nuclease prior to removal of
chromatin proteins. When the resulting DNA preparation is analyzed by electrophoresis, all of
the DNA appears as fragments 342 bp in length. What does this mean? (Why only 1 band and
why 342 insted of 410 )
