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Two sets of chromium analyses were performed on water samples from a stream that runs near a chromium plating plant:
Before the spill After the spill
Mean: 0.95 ppm Cr 1.10 ppm
N 5 6
S 0.05 ppm 0.08 ppm
Could it be stated, at the 95% confidence level, that after and before the spill there was no difference in the chromium level in the stream?
According to state government, the monthly incomes of college graduates have a standard deviation of $650. A county official believes that the standard deviation of monthly incomes is higher in her county.
Show that for k = 2 the likelihood ratio statistic of Exercise 25 can be expressed in terms of the ratio of the two sample variances and that the likelihood ratio test can, therefore, be based on the F distribution.
Perform an analysis of the problem facing Allied Insurance and prepare a report that summarizes your findings and recommendations.
The mean number of nonconforming coil springs in a batch is 5. Assume that the number of nonconforming springs in a batch, denoted as X, is a binomial random variable. What are n and p?
suppose x has a poision distribution with a mean of .4. determine the following probabilitiesa
1. according to a survey 63 of murders committed last year were cleared by arrest or exceptional means. fifty murders
The F-value is a ratio of two variance estimates. What variance is used as a numerator of the ratio?
At night, vehicles circulate on a certain highway with separate roadways according to a Poisson process with parameter λ = 2 per minute (in each direction).
Assuming that the store's sales are a representative sample of the stereo systems produced by the three manufacturers, use the 0.025 level of signifi- cance in testing whether the population percentages of warranty service returns could be equal.
Is the dependent variable discrete or continuous? interval, or ratio) is used to measure the dependent variable?
Select a variable. Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a sample of 30 for a second group. Use a z test.
suppose that 22.24 of all vehicles on the road get a fuel economy of at least 35 miles per gallon mpg. you conduct an
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