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Let f(x,y)(x,y) = 4/5(x+3y)e^(-x-2y) if x>0, y>0 be the joint distributiton of (x,y). Find the correlation coefficient.
An urn contains nine white balls and 11 black balls. A ball is drawn and replaced. If the ball is white your opponent pays you 25 cents. If it is black you pay him 25 cents. You have one dollar and
The average length of a new born baby is 20 inches with a standard deviation of 1 inch. If n=100, what is the mean of the sampling distribution of means?
The Comfort Widget Company makes several different sized widgets. The smallest widget the company manufatures has a mean diameter of 3.5 inches with a standard deviation of .35 inches. The distrabut
Using probability: How can you use probability to improve your chances of winning at a casino. Provide specific examples using concepts learned in this module. Book is Introductory Statistics, 9th e
Weinstein, McDermott, and Roediger report that students who were givne questions to be answered while studying new material had better scores when tested on the material compared to students who wer
A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 34,000 miles and a standard deviation od 2400 miles. He wants to give a guara
A random sample of n=25 scores is selected from a normal population with a mean of 20, and a treatment is administered to each individual in the sample. After the treatment, the sample mean is found
Scores on the ACT test have a distribution that is approximately normal with mean 21.1 and standard deviation 5.1. What is the probability that a student chosen at random will have an ACT score grea
In hypothesis testing for the difference between two means, d0, the hypothesized difference between the means is
By the Central Limit Theorem, the sampling distribution of (x1 - x2) is
At 99% confidence using the critical value approach, test management's belief. What is the p-value associated with the sample results? What is your conclusion based on the p-value?
Develop a 95% confidence interval on the population proportion based on the sample results. Determine how large a sample she would need to take in order to be 99% certain that the maximum error in t
A statistical model for appraisal value of houses is needed. An important predictor variable of appraised value is the number of rooms in any house; y = appraised value of the house (in thousands of
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least o
In this sample the mean NEFA was 435 with a standard deviation of 215. construct a 95% confidence intercal estimate of the mean fasting NEFA level for a population of women with gestational diabetes
A random sample of 16 emergency reports was selected from the files of an ambulance service. The mean time( computed from these sample data) required for ambulances to reach their destinations was 1
Describe a situation when you would prefer the median and the inter quartile range in describing a distribution over the mean and the standard deviation.
Grear Tire Company has produced a new tire with an estimated mean lifetime mileage of 37,500 miles. Management also believes that the standard deviation is 6,000 miles and that tire mileage is norma
Obtain a 95% confidence interval estimate for population varience, the standard deviation of the experimental group. Test the hypothesis that the experiment was effective at the alpha=0.05 significanc
As a part of the editorial a random sample of 310 households showed 230 own pets. Does this data disagree with the Pet Food Dealers Association data? Use a 0.10 level of significance. State the dec
Draw a graph of the possible sample proportions that would result from samples of 800 people from a population with a true proportion of .50.
The cost of a one-carat VS2 clarity, H color diamond from Diamond Source USE is $5,600. A midwestern jeweler makes calls to contacts in the diamond district of New York City to see whether the mean
What is the probability that a vehicle passing through the construction zone exceeds the posted speed limit? How many cars do you expect to exceed the posted speed limit if 40,000 vehicles passed thr
The data to the right represents the number of days of the growing season over the last 10 years in a certain area It is known that the data are normally distributed and s=23.89 days. Using these va