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Vegetable farmers try to avoid the use of insecticides because of expense and health hazards. However, if crops become too heavily infested, it becomes necessary to spray them. Suppose a farmer decides that she will spray her cabbages if their infestation with moth larvae is significantly greater than 20%.
a. If the farmer samples the crop to determine the percentage of infested cabbages, what is the null hypothesis?
b. What is the most logical choice for the alternative hypothesis? Why?
c. For n = 20 and a as close to 0.05 as possible, choose the region of rejection that is consistent with the alternative hypothesis.
Calculating the ANOVA F test P-value. For each of the following situations, find the degrees of freedom for the F statistic and then use Table E to approximate the P-value.
The data are in the file Pollution. Determine whether the three pollution-control methods will produce equal results.
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The weights of a random sample of cereal boxes that are supposed to weigh one pound are listed here. Estimate the variance of the entire population of cereal box weights with 90% confidence.
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Two researchers independently select simple random samples from a population of size N, with sample sizes m and n.
A company is calculating the cost of equipment maintenance for its budget. In order to decide the budget, the number of machine malfunctions, X, per month is considered. Determine the expected value, variance and standard deviation of the number of..
In 70,000 CABG surgeries, what is the expected number of retained foreign bodies?
Height of a man on a baseball team have a bell shaped distribution with a mean of 167 to seehim in a standard deviation of nine CM.
during the fishing opener the weight of a walleye caught was random. the weight of a walleye is uniformly distributed
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