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Biology and Environmental Science
Dissolved organic compounds (DOCs) consist of a variety of organic material in water systems. These dissolved particles are mostly the result of decaying organic matter and highly organic soils. The DOC concentration is one measure of the quality of a water system.
Independent random samples of water in the Clackamas River in northwestern Oregon at four locations were obtained, and the DOC was measured for each (in mg/L). Is there any evidence to suggest at least two population mean DOC concentrations are different? Use a = 0.01.
use the distribution tool to find the t values that form the boundaries of the critical region for a two-tailed test with o= .05 for each of the following sample sizes. use three decimal places.
question the wester refineria company statistician wants to estimate the proportion of customers who use a credit
Same population with a known mean of 1.8 grams. Do the bats appear to be from the same population? You may assume the sample data comes from a population that follows a normal distribution.
File a claim is 0.0005. Suppose they wrote 400 policies for the coming weekend, what is the probability that exactly two claims will be filed?
The second attributed to wearout, has a Weibull distribution with a characteristics life of 10 year and a shape parameter of 1.8. Determine the system reliability for a design life of 1 year. Find by trial and error the median time of failure.
A pharmaceutical company has developed a screening test for a rare disease that afflicted 2% of the population. Unfortunately, the reliability of this test is only 80%, which means that 20% of the tested will get a false positive.
Compute the sample correlation coefficient r. Compute the coefficient of determination. Give a brief explanation of the meaning of the coefficient of determination in the context of this problem.
A gasoline tank for a certain car is designed to hold 15 gallons of gas. Suppose that the variable x = actual capacity of a randomly selected tank has a distribution that is well approximated by a normal curve with mean 15.0 gallons and standard d..
worldwide it is understood that iq scores follow a normal distribution. it is assumed that the middle 95 of the
Calculation of the Probability of Increase in Income and Wealth and Increase in Happiness
Determine the maximum error of the estimate, E. Determine the confidence level used for the given confidence interval.
during the study patients have relapses of the fever at an instantaneous rate of 1.85 per month. what is the
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