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Technical data provided with a room dehumidifier explain that units tested from the production line consume a mean of 800 watts of power, with a standard deviation of 12 watts. The superintendent of a large office complex, upon evaluating 30 of the units recently purchased and finding their mean power consumption to be 805 watts, claims that her shipment does not meet company specifica- tions. At the 0.05 level of significance, is the superintendent's complaint justified?
If an A is given to a student who scores 90% or above, what would the minimum z-score be for a 300 multiple choice question test with a mean of 195 and a standard deviation of 30?
If the life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age?
the computer chips in notebook and laptop computers are produced from semiconductor wafers. certain semiconductor
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. Find the following:
quality progress february 2005 reports on the results achieved by bank of america in improving customer satisfaction
Are your decisions consistent in parts a and b? Explain why or why not.
The planned shortage inventory model recommends order quantity Q* = 70 and shortage level S = 18. Which of the following statement is incorrect?
Difference Between Samples with Same or Equal Mean
Could you conclude that Queens College Professors live longer than average? Use the appropriate two-tailed test with an α = 0.05. Also, construct a 95% confidence interval. Do the statistical test and the confidence interval agree? Write up your resu..
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
1. the incidence of occupational disease in an industry is such that the workers have a 20 chance of suffering from
The probability density of the net weight in ounces of a packaged compound is f(x)=2.0 for 19.75
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