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4. Sketch a relative frequency histogram for hte 36 sampl means. Use 9 classes. Is the histogram approximately bell shaped and symmetic? Does this agree with the results predicted by the Central Limite Theorem?
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This is a statistic problem.
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The average score on a particular exam is determined to be 84.35 with a standard deviation of 7.4. Assume the scores are normally distributed. Applicants with exam scores in the lower 10% are directed to special retraining. What is the minimum score required to not be directed to retraining?
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statistics project
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Let X denote the distance (m) that an animal moves from its birth site to its first territorial vacancy it encounters. Suppose that for banner-tailed kangaroo rats, X has an exponential distribution with parameter λ = .01386 (as suggested in the article...
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Consider a coin with a fixed, but unkown, probability of turning up heads. Treat the unkown parameter as a random variable with a uniform prior. Given a sequence of independent flips of such a coin, derive a simple expression for the probability that the next flip will be a head.
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Which of the following foods has not been implicated in the production of criminal violence?
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Annual starting salaries for college graduates with business administration degrees are believed to have a standard deviation of approximately $2,000. Assume that a 95% confidence interval estimate of the new annual starting salary is desired. How large a sample should be taken if we do not...
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A heavy equipment salesperson can contact either one or two customers per day with probability 1/3 and 2/3 respectively. Each contact will result in either no sale or a $50,000 sale, with the probabilities .9 and .1 respectively. Give the probability distribution for daily sales. Find the mean...
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The grades of class are A 10%, B 20%, C 40%, D 20% and F 10%. A.) if we assume that the grades are normally distributed, how many standard deviations on either side of the mean will consist C grades? b.) suppose that distribution of grades has average of 78 with standard deviation of 11. Find...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
- 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?
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