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Dandelions are studied for their effects on crop production and lawn growth. In one region, the mean number of dandelions per square meter was found to be 8.0. Use the Poison distribution to find the indicated probabilites.
a. Find the probability of 6 dandelions in an area of 1 m ²b. Find the probability of at least 6 dandelions in an area of 1 m ²c. Find the probability of at most 7 dandelions in an area of 1 m 2
According to Chebyshev's Theorem, how many students scored between 23 and 95?
The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level.
A new group comes along and that only has 5 people. Their weights are also measured initially and after 9 weeks. What would be the most accurate methodology for determining the percentage of weight loss for this new group?
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all ten questions, what is the probability he answers at least half correctly?
Heights of college-aged women are approximately bell-shaped and symmetric, with almost all of them (95%) falling between 58" and 72". Find the approximate values of the mean and standard deviation.
Brain cancer is a rare disease. In any year there are about 3.1 cases per 100000 od population. Suppose a small medical insurance company has 150000 people on its books.
The finished subassembly two must be inspected. A list of activities, their predecessors, and their durations is given in the following Table.
When estimating a population mean with a confidence interval estimate, then E is:
Note that Σ x = 2233 and Σ x 2 = 138,053. At the 5% level of significance, can the instructor conclude that the new mean is different from 64?
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
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