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A new light bulb is being considered for use in an office with computers. It is decided that the new bulb will only be used if it has a mean lifetime of more than 500 hours. A random sample of 40 bulbs is selected and placed on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Perform the appropriate test of hypothesis to determine whether the new bulb should be used. Use a 0.01 level of significance.
A. 0 tailedB. 2 tailedC. 1 tailed leftD. 1 tailed righ
As his appointment time approaches, you prepare a short explanation of the way that capital gains taxes may be hurting his net returns and the difference between short-term gains and long-term gains.
The density of ship traffic was expected to decrease during the winter months. A sample of n = 90 daily recordings of ship sightings for December, January, and February yielded a mean and variance of Y = 4.7 and s2 = 4.9. Find a 90% confidence interv..
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
real estate apperaiser may use simple or stratifief sampling technigue to drawn random samplegenrate a random sample
X2 is college board score (range 200-800). Use the multiple regression equation to predict college gpa for a high school gpa of 3.6 and a college board score of 600.
an office meeting consists of 4 managers and 7 staffa each working team consists of one manager and at least 1 but not
for each of the following questions explain whether a confidence interval for a mean response or a prediction interval
suppose the following data are selected randomly from a population of normally distributed values.44 51 43 48 45 57 54
Twenty-eight items are randomly selected from a population of 260 items. The sample mean is 38 and the sample standard deviation 5. Develop a 90 percent confidence interval for the population mean.
if the temperature at which a certain compound melts is a random variable with mean value 120 degree celsius and
Surgical Intensive Care Unit would like to be better prepared by predicting number of surgical patients they must expect and forecast for day 16 by using 3-period Moving Average? Forecast for day 16 by using 3-period Moving Average and forecast for d..
Determine the optimal shipments between the European ports and the warehouses and the distribution centers to minimize total transportation costs
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