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Mosquito insecticide study. A species of Caribbean mosquito is known to be resistant against certain insecticides. The effectiveness of five different types of insecticides-temephos, malathion, fenitrothion, fenthion, and chlorpyrifos-in controlling this mosquito species was investigated in the Journal of the American Mosquito Control Association (March 1995). Mosquito larvae were collected from each of seven Caribbean locations.
In a laboratory, the larvae from each location were divided into five batches and each batch was exposed to one of the five insecticides. The dosage of insecticide required to kill 50% of the larvae was recorded and divided by the known dosage for a susceptible mosquito strain. The resulting value is called the resistance ratio. (The higher the ratio, the more resistant the mosquito species is to the insecticide relative to the susceptible mosquito strain.) The resistance ratios for the study are listed in the table below. The researchers want to compare the mean resistance ratios of the five insecticides.
(a) Explain why the experimental design is a randomized block design. Identify the treatments and the blocks.
(b) Conduct a complete analysis of the data. Are any of the insecticides more effective than any of the others?
A and B are both age 62. A is a newly selected life, while B was first selected at age 61. What is the probability that the second death of A and B will occur between 2 and 3 years from now?
weights of pacific yellowfin tuna follow a normal distribution with mean weight of 68lb and standard deviation 12 lb.a.
This assessment will allow you the opportunity to choose two areas of Human Resource Management that you are interested in, and conduct an in-depth analysis to address specific components within each area.
Find the maximum total allowable weight if we want a 0.975 probability that this maximum will not be exceeded when 17 males are randomly selected.
In the order of operations Pemdas requires that exponentation takes precedence over multiplication, so we cannot multiply 4*2 without first evaluating 2^x, but we could divide both sides by 4.
In the absence of outliers, do you think the distribution of salaries is symmetric, skewed to the left, or skewed to the right?
Determine the equation of the line of regression and describe the apparent relationship between age and peak heart rate.
Find the test statistic P-value, and critical value, and state the final conclusion.
13 A company that supplies ready-mix concrete receives, on average, six orders per day. (a) What is the probability that, on a given day:
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes? (Round your answer to 4 decimal places.)
the claim is the proportion of peas with yellow pods is equal to 0.25 or 25. the sample statistics from one experiment
Determining probability when guessing answers. Test comprise of multiple- choice questions each having 4 possible answers (a, b, c, d) one of which is right. Suppose that you guess answers to six such questions.
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