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The manufacturer of a certain brand of light bulb claim that the variance of the lives of these bulb is 4200 square hours.a consumer agency took a random sample of 25 such bulb and tested them. the variance of he lives of these bulb was found to be 5200 square hours. assume that the lives of all such bulb (approximately) normally distribution.
a) make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
b) test at the 5% significant level whether the variance of such bulbs is different from 4200 square hours.
Assume a population standard deviation of 350 kilowatt hours. Determine the standard error of the mean. With a 0.95 probability, determine the margin of error or standard error.
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If a student scored 90 points on a test where the mean score was 82.2 and the standard deviation was 5.7. What steps do I do to find out the student's z score?
Develop the management-research question hierarchy that will help you to develop a specific proposal.
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Department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
They became ________ likely to underperform on aptitude tests and ________ likely to become aggressive toward someone who had insulted them.
The time a cashier spends processing individual customer's order are independent random variables with mean 2.5 minute and standard deviation of 2.
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
What is the probability that 30% or fewer male employees will indicate that they have to pick up the slack for mom's working flextime ?
First step of analytical hierarchy process doesn't include?
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