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Clark Hester is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the night shifts than on the day shift. Assume the population standard deviation for the number of units produced on the day shift is 21 and 28 on the night shift. A sample of 54 day shift workers showed that the mean number of units produced was 345. A sample of 60 night shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger?
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
If student is chosen at random, determine the probability that he or she is sophomore and owns a credit card.
How is data screening related to the assumptions of the statistic you will choose to analyze your data?
A sample of size 36 results in a sample mean of 7.1. The value of the test statistic is ____
What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? Why might a driver be tempted not to use a seat belt "just on thi..
Compare a three-month moving average forecast with an exponential smoothing fore-cast for a = 0.2. Which provides the better forecasts using MSE as the measure of model accuracy?
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
What is the population from which your sample has been taken? Description of data taken from other sources. Preliminary analysis using histograms, box plots, scatter plots, etc. and investigation of outliers. Do you keep or discard identified outl..
That's a much larger sample than standard sample surveys. In spite of this, we can't trust the result to give good information about any clearly defined population. Why?
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