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The following numbers are observations on tensile strength of synthetic fabric specimens selected from a production process at equally spaced time intervals. Construct appropriate control charts, and comment (assume an assignable cause is identifiable for any outof-control observations).
an average computer mouse inspector can inspect 55 mice per hour with a population standard deviation of 14 mice per
The cell phone industry is growing at a rapid pace. Current estimates suggest that 60% of people have cell phones. Suppose 25 people were randomly and independently sampled.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
a) What percent of all costs and expenses were cost of revenues in 2005? In 2006? b) What percent of all costs and expenses were due to re- search and development in 2005? In 2006? c) Have general administrative costs grown as a percentage of all cos..
for a normal distribution with a zero mean and standard deviation of one use 10 random variables samples to compute the
many project managers use critical path analysis to minimize slack time in projects and ensure tasks are completed in a
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
What proportion of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)
Suppose that the chance of rain tomorrow is 60%. What is the probability that John will practice his piano lesson?
What is the projected demand for the test equipment for time period 25 based upon using a 3-month moving average forecast model - What are the bias, mean absolute deviation
the effect of exercise and diet on body weight is being studied. researchers at a major university have a list of 2500
How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence.
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