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A local environmental agency has selected a simple random sample of 16 homes to be tested for tap-water lead. Concentrations of lead were found to have a mean of 12 parts per billion and a standard deviation of 4 parts per billion.
Considering that the homes were selected from a community in which there are 100 homes, construct and interpret the 95% confidence interval for the population mean.
Based on your results, comment on the possibility that the average lead concentration in this community's homes might exceed the Environmental Protection Agency's recommended limit of 15 parts per billion of lead.
suppose x and y are continuous random variables with joint pdf fx y 24xy 0 lt x 0 lt y and x y lt 1 and zero
This is called a one-time fling. About 10% of all adults deliberately do a opne-time fling and feel no guilt about it!
Four have a 4/10,000 chance for failure. One component has a 1/100 chance for failure. What is the overall reliability of the product?
If PV is a tree before observing the evidence, then we would like PV PV |A= a to be also represented as a tree. Is this always possible?
A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are shorter than 3 inches.
Financial Analysts, Inc., is an investment firm that manages stock portfolios for a number of clients.
instead of rolling a die 100 times use statcrunch to simulate 100 rolls of a die. use statcrunch to create a random
the content of a particular constituent in two different brands of a drug measured in milligrams was found to be as
Suppose you want to sell your house and you have decided to accept the first offer exceeding M dollars, say. Assume that the offers are i.i.d. with common distribution F. Find the expected number of offers received before selling the house.
Define irregular component in time series and explain the differences between other components as well as its effects.
a multiple-choice test contains n questions. if answers are randomly selected the correct answer will be selected with
for the valuesx- 3568y- 47710.calculate the followinga. correlation coefficientb. coefficient of determinationc.
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