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Assume the commuting time for people who work in the New York City is normally distributed with average of 42.3 minutes and standard deviation of 8.5 minutes.
He desires to set the prices of the condominiums he wants to sell so that he would cover the middle 75% of market in terms of price range. What must he set the minimum and maximum prices of hi
Nothing is known regarding the distribution of distribution except that the standard deviation is 100. If a sample of 50 students is randomly chosen, find out the probability that their average SAT
Assume a fair die is rolled 120 times. Find out the probability that the number of rolls that the score is six is between 15 and 25 (comprising both 15 and 25)?
Let X and Y have joint pdf f (x, y) = ke-2xe-y for x, y ³ 0. Find out the marginal pdf's for X and Y and using them obtain E(X) and E(Y).
A die with 4 sides {1, 2, 3, 4} is tossed 2 times. Let X equal the maximum of two observations and let Y equal the minimum. Find out the joint pmf of X and Y, and correlation coefficient. Are X and
The owner of Britten's Egg Farm desires to estimate mean number of eggs laid per chicken. A sample of 20 chickens shows they laid the average of 20 eggs per month with standard deviation of two eggs
What are the values for a and b? What is the mean of this uniform distribution? What is the standard deviation? Show that the total area is 1.00.
According to insurance institute of America, family of 4 spends between $ 400 and $3,800 for each year on all kinds of insurance. Assume then money spent is uniformly distributed between these
A biopsychologist studies role of brain chemical serotonin in aggression. One sample of rats serves as the control group and receives a placebo.
A normal distribution has mean of 80 and standard deviation of 14. Determine the value above which 80 percent of the values will occur.
A population is estimated to have the standard deviation of 10. We want to estimate population mean in 2, with 95 percent level of confidence. How large a sample is needed?
A researcher would like to find out if relaxation training will affect number of headaches for chronic headache sufferers. For the week prior to training, each participant records number of headache
Find out x-bar and s for this data set. At 10% significance level, do the data offer evidence that the mean life for company's light bulbs differs from the advertised mean? You might suppose the val
According to College Board's report, the average tuition and fees at 4 year private colleges and universities in United States was $20,273 for the academic year 2002 - 2003 and standard deviation wa
A public bus company official claims that mean waiting time for bus number 14 throughout peak hours is less than 10 minutes. Karen took bus number 14 throughout peak hours on 18 different occasions.
Analysis of the variance lets researchers to compare many different treatment conditions without conducting many different hypothesis tests.
In order to monitor ecological health of Florida Everglades, many measurements are recorded at different times. The bottom temperatures are recorded at Garfield Bight station and mean of 30.4&
In each of following situations, state whether or not given assignment of probabilities to given outcomes is legitimate, that is, satisfies the rules of probability distribution.
Data from the National Health Survey show describe that men's average weight is normally distributed with mean of 170 pounds and standard deviation of 30 pounds.
A psychologist would like to analyze the effects of new drug on activity level of animals. Three samples of rats are selected with n = 5 in each sample.
A chi-square test for goodness of fit is employed to test whether or not there are any preferences among 3 brands of cola. If the study employs a sample of n = 60 subjects, then the expect
The college is planning to add the food vendor in student union and would like to know what kind of food service the students would prefer.
Employ your model from (b) to predict crude oil production in 1974. How comfortable do you feel with this prediction? Support your answer with proper statistical evidence.
A certain airplane has two independent alternators to offer electrical power. The probability that the given alternator will fail on 1-hour flight is .02. Find out the probability that