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A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050 (σ = 1050), how large of a sample is needed to be accurate within $150 (E = 150)? That is, find n.
a. Find the degrees of freedom for unequal variance test. (Round down answer to nearest whole number.)
Some food retailers propose subjecting food to a low level of radiation in order to improve safety, but sale of such "irradiated" food is opposed by many people. Suppose a grocer wants to find out what his customers think.
One of your customers, Margaret Port, has referred you to a friend who needs your Hercules Shelving for a storage warehouse
What can we conclude from these figures at a level of significance of .01?
a study is conducted to determine whether sunshine affects depression. eight individuals are given a questionnaire
annual maximum wind speed gusts have been modeled as both a type i gumbel and type ii largest extreme value. if the
three vendors have vegetable stands in a row. customers arrive at the stands 1 2 and 3 at rates 10 8 and 6. a customer
a) What percent of all costs and expenses were cost of revenues in 2005? In 2006? b) What percent of all costs and expenses were due to re- search and development in 2005? In 2006? c) Have general administrative costs grown as a percentage of all cos..
Use technology to find the estimated minium required sample size. The minimum sample size required is ? Computer users round to the nearest whole number. What is a major obstacle to getting a good estimate of the population mean?
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
Find the stationary distribution of the Markov chain.
A western blot assay is a blood test for the pressure of HIV. It has been found that this test sometimes gives false positive results for HIV.
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