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An employee of a bank wants to test the null hypothesis that on the average the bank cashes 10 bad checks per day against the alternative that this figure is too small. If he takes a random sample and decides to reject the null hypothesis if and only if the mean of the sample exceeds 12.5, what decision will he make if he gets = 11.2, and will it be in error if
one hundred items are simultaneously put on a life test. suppose the life-times of the individual items are independent
Let X1,... x30 be independent Poisson random variables having mean 1. (a) Use Chebyshev's inequality to find a lower bound on the probability.
What is the portion of students obtaining scores between 85 and 95 and what is the score needed to be at the top 10% of the class and what is the probability that the value of the portfolio is greater than $2,000?
A shipment of 150 television sets contains three defective units. If a vending company buys three of the units in the shipment, what is the probability that at least one of the units is defective?
there are 40 students in an elementary statistics class. on the basis of years of experience the instructor knows that
the use of a tremendously large sample does not solve the question of quality for an estimator. what problems do you
The standard deviation of the monthly growth rates will remain 60%. Is the increased investment growth worth the consulting fee?
mr. brown owns two furniture stores. in store 1 the number of sofas sold per week by a salesperson is on average 13 per
A single box contains 12 gloves, and it has been determined that 6 percent of gloves are defective. What is the likelihood that a box of gloves gets rejected?
researchers collected data from a random sample of men and women to determine if women spend more time doing housework
Rob Richman, president of AmeriBank, takes off his glasses, rubs his eyes in exhaustion, and squints at the clock in his study. It reads 3 AM. For the last several hours, Rob has been poring over AmeriBank's financial statements from the last thre..
1000 rolls of a fair die are made. find the approximate probability that 6 appears between 150 and 200 times. if 6
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