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In very large population, the distribution of annual income is skewed, with a long right tail. We take a simple random sample of n people from this population and record the n incomes. We expect a h
A report says that 82% of British Columbians over the age of 25 are high school graduates. A survey of randomly selected residents of a certain city included 1290 who were over the age of 25, and 10
Suggest the e-billing case. The mean and standard deviation of the sample of 65 payment times are 18.1077 and 3.9612, respectively.
Suppose that we wish to test H0:u = 80 versus Ha: u > 80, where population standard deviation is known to equal 20. Also, suppose that sample of 100 measurements randomly selected from populatio
Birth weights at local hospital have normal distribution with mean of 112 ounces and standard deviation of 16 ounces.
In your own terms, discuss the purpose of quality control in production and service operations. Determine control charts and how are they employed in quality control? Determine the two cause of proc
A bag of 27 tulip bulbs contains 12 red tulip bulbs, 8 yellow tulip bulbs, and 7 purple tulip bulbs. Determine the probability that two randomly selected tulip bulbs are both red?
A company developed new shampoo to reduce dandruff. Six persons tried that shampoo. Suppose that the probability that a person gets some relief is 0.60.
What is the probability the hand has 2 cards from some suit, 2 cards from another suit, 1 card from another suit, and 1 card from remaining suit
Assume small aircraft arrive at the certain airport according to the Poisson process. The mean time between arrivals of small aircrafts is 0.25 hour.
Let the random variable X describe the dollar amount spent in supermarket impulse buying in 10-minute (unplanned) shopping interval. Based upon a Denver Post article, the mean of probability distrib
SAT verbal scores are normally distributed with the mean of 430 and standard deviation of 120. A sample of 36 students is chosen randomly. Can the sampling distribution of the sample means, for this
The number of cases of tetanus reported in the United States during a single month in 1989 has a Poisson distribution with parameter h = 4.5 [8].
Determine the probability distribution of X|Y = 0, and E[X|Y = 0]. Determine E[Y ] and E[X]. Determine the probability that Y is larger than zero.
Assume we flip the fair coin four times. Let X = number of heads, Y = 1 if last flip is a tails.
A company makes certain device. We are interested in lifetime of the device. It is determined that around 2% of the devices are defective from start so they've the lifetime of 0 years. If the device
Suggest the experiment of tossing two die. Illustrate the random variable Y to be the product of the two face values observed.
The following contingency table cross-classifies medical school faculty by the characteristics gender and rank.
A system may fail because of any of following events takes place: E1=ABC, E2=CD, E3=AD. If Pr(A)=Pr(C)=0.9, Pr(B)=Pr(D)=0.8, compute the failure probability of the system using:
The distribution of amount of money in savings accounts for the University of Alabama students has average of 950 dollars and standard deviation of 1,000 dollars.
In binomial experiment, is it possible for probability of success to change from one trial to the next? Discuss. Choose one of the following.
Twenty-nine percent of Americans say they're confident that passenger trips to moon will take place in their lifetime. You randomly sample 200 Americans and ask if they think passenger trips to the
Assume 60% of American adults think Martha Stewart is guilty of obstruction of justice and fraud related to insider trading. We will take a random sample of 100 American adults and ask them the ques
A certain Westie breeder is accused of the underfeeding his dogs. A sample of 25 dogs is taken from breeder, and dogs are weighed. Determine the probability the sample mean is less than 14 pounds?
Determine the probability, p, of success for each trial? Is the value of p same for each trial? Discuss why. Determine the number of trials for this binomial distribution?