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The supervisor of a production line that assembles computer keyboards has been experiencing problems since a new process was instituted. He notes that there has been an increase in defective units and occasional backlogs when one station's productivity is not matched by that of other stations. Upon reviewing the process, the supervisor discovered that the management scientists who developed the production process assumed that the amount of time to complete critical part of the process is normally distributed with a mean of 130 seconds and a standard deviation of 15 seconds. He is satisfied that the process time is normally distributed with a standard deviation of 15 seconds but he is unsure about the mean time. In order to examine the problem he measures the time of 100 assemblies. The mean of these times was calculated to be 126.8 seconds. Can the supervisor conclude at the 5% significance level that the assumption that the mean assembly time if 130 seconds is incorrect?
State the null and alternative hypothesis that best tests the hypothesis of interest. Be sure to pay attention to whether this should be a 1-tailed or a 2-tailed test.
Carry out this test, and state whether you reject or fail to reject the null hypothesis. In computing the test statistic, be sure to indicate whether you are using "t" or "z". Use the precise critical value of the "t" or "z" you use, not an approximation.
Determine whether the following definitions are stipulative, lexical, precising, theoretical, or persuasive.- "Neurosis" means a chronic emotional disturbance that arises from suppressed or forgotten emotional stress (such as resentment, hostility,..
a. Specify the null and alternative hypotheses to test the diet center's claim. b. Calculate the value of the test statistic T.
Technology and the Internet In early 2013, Cree, Inc., introduced a new, cheap LED light that uses much less electricity and is designed to last for years.
universities play a significant role in the provision of higher education within australia. as part of the goal to
Julie is faster but less consistent than Alison, and her times are normally distributed with mean = 33 minutes and standard deviation = 2 minutes. On any day, their times are independent of each other. Can Alison ever beat Julie?
Line regression equation is given as y = 40 + x. What would happen to value of y if we increase x by 1.
Assuming that the true proportion of all Pennsylvania households with annual incomes of at least $70,000 is 0.217, find the probability of not rejecting a false null hypothesis when the sample size is 200.
Oil production 2005. The following table shows the oil production of the United States from 1949 to 2005 (in thousands of barrels per year).
A female offspring has no chance of inheriting the disease. Further suppose that 51.3% of births are male. What is the probability that a randomly chosen child will be affected by the disease?
The Safety Council estimates that off-the-job accidents cost businesses almost $500 billion annually in lost productivity. Based on their estimates, companies with hundred employees are expected to have six off-the-job accidents per year. a) What ..
What is a coding system? What are some important considerations when developing a coding system?- What is a case study? When are case studies used? What is a psychobiography?
suppose that the number of dice thrown is a binomial random variable with n 10 and p 0.98. what is the expected
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