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1. The quality control manager at a light-bulb factory needs to estimate the mean life of a new type of light-bulb. The population standard deviation is assumed to be 50 hours. A random sample of 35 light-bulbs shows a sample mean life of 490 hours. Construct and explain a 90% confidence interval estimate of the population mean life of the new light-bulb.
2. A survey of first-time home buyers found that the sample mean annual income was $46,000. Assume that the survey used a sample of 25 first-time home buyers and that the sample standard deviation was $1,100. Compute and explain a 95% confidence interval estimate of the population mean.
3. A telephone poll of 950 American adults asked "where would you rather go in your spare time?" One response, by 275 adults, was "the Mall". Compute and explain a 99% confidence interval estimate of the proportion of all American adults who would respond "the Mall".
4. For problem #1 above, what size sample would be needed to achieve a margin of error of 15 hours or less?
What about longer term dynamics of the global economy? What might be those benefits or losses
The plant will require a major overhaul every 5 years, costing $1M. Determine the benefit/cost ratio at the city's interest rate of 6%.
An analysis of the market structure the industry - discussion about the demand and supply conditions for your product(s) or service(s)
If the discount rate is 7 percent, what is the present value of these cash flows? (Do not round intermediate calculations and round your answer to 2 decimal pla
Phelps was embroiled in a number of controversies outside the pool. What impact did these shortcomings have on his brand value?
Suppose the own price elasticity of demand for good X is -3, its income elasticity is 1, its advertising elasticity is 2, and the cross-price elasticity of demand between it and good Y is -4.
Discusses an example of a regulatory measure which was supposed to serve public interest, but in reality serves private interest.
Arian is about to borrow $2350 from his uncle. He has an option to repay the loan at the end of year 5 with 10.75% simple interest per year or with 5% interest per year, compounded annually. What is the difference of the total interest paid over 5 ye..
For each of the following utility functions, calculate (or figure out) the MRS and sketch out an indifference curve for U=4, plotting at least 2 points on each curve, and explain whether the preferences violate the diminishing MRS or convexity of ind..
Discuss the similarities and the differences between database tables and database views.
q.a central bank finds itself in the following situation the national economy has been in a slump for several years but
Make sure you write in a clear, concise, and organized manner; demonstrate ethical scholarship in appropriate and accurate representation and attribution of sources; display accurate spelling, grammar, and punctuation.
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