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A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service. The company has been able to provide its customers with a completion time of 6 days or less. To analyze whether the completion time has increased, the production manager took a sample of 25 jobs and found that the sample mean completion time was 6.5 days with a sample standard deviation of 1.5 days. At a significance level of .05, test whether the completion time has increased. ( form the hypotheses, show the critical and calculated values of the test statistic and perform the test)
Perform a parametric analysis by assessing the fractional change in the probability of failure with respect to a small change in the mean and standard deviation of selected variable.
Four students are talking about the kind of energy that's fundamental to life on Earth. Thomas says it is electrical energy. Susan opts for solar energy. Lawrence argues in favor of chemical energy. Kimberly is sure it's mechanical energy. Who is ..
at a local fast-food joint cars arrive randomly at a rate of 12 every 30 minutes. it takes an average of 2 minutes to
Find the probability that a randomly selected student is a nursing major. Find the probability that a randomly selected student is a nursing major given that the student is a male.
What is the population under consideration and what are the two variables under consideration and find the conditional distributions of birth region.
An average department store sells 350 men's suits per year. The men's suit departments at a particular national chain of stores claim they sell more than the industry average. In 35 of their stores, they sold, on the average, 430 suits per year wi..
Would it be reasonable to use the least-squares line to predict a car's mileage from its age for a Council High School teacher? Justify your answer.
among 35-40 year olds 39 say they have operated heavy machinery while under the influence of alchol. suppose three
Find the critical value(s) and identify the rejection region(s). Find the standardized test statistic z. Decide whether to reject or fail to reject the null hypothesis.
a. Suggest an appropriate dependent variable. b. Write a model for this experimental situation and identify all terms. c. Fill out the sources and degrees of freedom for an AOV table.
The mean IQ of the sample is 105. Is there enough evidence to suggest that the average IQ has changed?
Assuming the percentages are based on independant simple random samples of 1,000 first year college students drawn each year.
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