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1. Records show that the probability that it rains in our town on a single day is 0.35. If rain on different days constitutes independent events, find the probability that it:
a. Rains on neither of two given days.
b. Rains on both of two given days.
c. Rains on exactly one of the two given days.
2. An eight-cylinder engine (8 spark plugs) has two spark plugs that need to be replaced.
a. If one spark plug is replaced randomly, what is the probability that one of the bad ones is replaced?
b. If two are replaced randomly, what is the probability that both bad ones are replaced?
3. A parts store sells both new and used parts. Sixty percent of the parts in stock are used. Sixty-one percent are used or defective. If 5% of the store's parts are defective, what percentage are both used and defective?
Nationwide, the average time until a electric utility customer service representative answers a call is 260 second. The Gigantic Kilowatt Energy Company rnadomly sampled 30 calls and found that, on average, they were answered in 227 second with a ..
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Find the probability of a type I error α if the true proportion is p=0.6.
A hypothesis test is performed to test the claim that a population proportion is greater than 0.7. Find the probability of a type II error, β, given that the true value of the population proportion is 0.72. The sample size is 50 and the significan..
For its validity, all hypothesis testing depends heavily on the assumption that the sample that is used was drawn using probability sampling techniques.
question 1 the following data are results from a study you recently completed. calculate the correlation coefficient
And a standard deviation of 10 inches. What is the probability that the mean annual precipitation during 25 randomly Picked years will be less than 109.8 inches?
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Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
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