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Is the normality assumption that was made at the beginning valid? Why or why not? Hint: Construct a histogram and include this in your submission.
Use a 0.05 significance level to test the claim that the two ponds have the same mean salinity value.
Mitch thinks that there is a difference in quality of life between rural and urban living. He collects information from obituaries in newspapers from urban and rural towns in Idaho to see if there i
Suppose we draw 13 cards out of a deck of 52. What is the expected value of the number of aces we get?
Future Electronics makes CD Players. Its research department found that the life of the laser beam device is normally distributed, with mean 5000 hours and standard deviation 450 hours.
An agricultural field trial compares the yield of two varieties of corn. The researchers divide in half each of 14 fields of land in different locations and plant each corn variety in one half of ea
Suppose X and Y have joint density f(x,y) = 10x^2y when 0 < y < x < 1. a) Find the marginal densities of X and Y and the,
1. A random sample of 16 size D batteries for cars yield a mean of 2.8 hours with standard deviation, 1.3 hours. (a) Find the critical value, t*, for a 99% CI. t* =
Jude is interested in buying a digital camera. He visited 9 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 350.22 and a standard deviati
An SRS of size 10 is drawn from a population that has a normal distribution. The sample has a mean of 111 and a standard deviation of 4.
Assume that IQ scores are normally distributed with a standard deviation of 15 points and a mean of 100 points. If 100 people are chosen at random, what is the probability that the sample mean of IQ
A new muscle relaxant is available. Researchers from the firm developing the relaxant have done studies that indicate that the time lapse between administration of the drug and beginning effects of
Let x bar be the mean sample length of these fish. What is the probability that x bar is within 0.5 inch of the claimed population mean? Show all work. Then, provide a brief step by step explanation
Express Courier Service has found that the delivery time for packages is normally distributed, with mean 14 hours and standard deviation 2 hours.
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probabilities table to find the probability of x successes given the probability p of suces on
A pharmaceutical Company receives large shipments of aspirin tablets. The acceptance sampling plan is to randomly select and test 15 tablets, then accept the whole batch if there is only one or none
Assume that a procedure yields a binomial distribution with a trial repeated ntimes. Use a binomial probabilities table to find the probability of x successes given the probabability p of sucess on
Box A contains four white marbles and seven black marbles. Box B contains five white marbles and six black marbles. An experiment consists of first selecting a marble at random from Box A.
The Rayleigh probability density function is the special case of the Weibull probability density function, when %u03B1, the Weibull shape parameter, is 2. That is, a Rayleigh random variable, X has
A survey of a simple random sample of university alumni finds that six months after graduation, 75 of the 100 liberal arts majors and 45 of the 50 business administration majors had found employment
Suppose Y is the daily revenue for some company, where E(Y) = $10,000 and Var(Y) = $^2 540,000 and ?y = $734.85.
A survey of a simple random sample of recent university graduates finds that six months after graduation, 75% of the 400 students surveyed had found employment within their field of study. Is this s
According to an airline, a particular flight is on time 95% of the time. Suppose 10 flights are randomly selected and the number of on time flights is recorded.
A scientist is proposing a study on the level of violence in teenagers. He feels that the boys are more violent than females. Violence tests were conducted with 50 randomly selected boys and females
Construct a 99% confidence interval for the population proportion of brown eye people in the United States.