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Could you please help in answering the following question? The quality control manager at a light globe factory needs to estimate the mean life of large shipment of energy-saving compact light globes. The historical standard deviation of light globe life is 250 hours. A random sample of 64 light globes indicates a sample mean life of 7,940 hours. a) Construct a 95% confidence interval estimate of the population mean life of light globes in this shipment b) Do you think that the manufacturer has the right to state that the light globes last on average of 8,000 hours? Explain! c) Must you assume that the population of light globe life is normally distributed? Explain! d) Suppose that the standard deviation changes to 180 hours. What are your emended answers in part (a) and (b)?
A sample of 36 packages reveals the mean weight to be 3.01 pounds, with a standard deviation of 0.03 pounds. What is the estimated population mean?
In other words, what other variables might you collect that you might plausibly expect to have an impact on the change in test scores aside from income and the curriculum type?
Discuss how you would investigate the operations of the plant to determine why the proportions were off the targeted values. Speculate on three or more possible conditions in plant and bagging process that could have caused the observed results.
In his report to the mall management, can he say that shoplifting is twice as likely to be the cause of the loss as compared with either employee theft or poor inventory control and that employee theft and poor inventory control are equally likely..
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
A restaurant monitors its customer's complaints, With information, which of the following is a Pareto chart of the data?
Construct and interpret a 90% confidence interval to estimate the mean fuel savings in the population of all such vehicles.
On average, 8% of the subscribers respond to the survey. Of the 8% who respond, an average of 53% say they will renew. Sample and Population.
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
Determine the estimated regression equation that can be used to predict the star rating given the point values for execution, ease of use, and range of offerings.
the probability that it will improve is .10. Determine the best country to construct the new facility in and the expected value of perfect information.
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
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