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The probability distribution of a discrete random variable X is given by:
P(X = -1) = 1/5 ,P(X = 0) = 2/5 ,P(X = 1) = 2/5 .
a. Compute E[X].
b. Give the probability distribution of Y = X^2 and compute E[Y ] using the distribution of Y .
c. Determine E[X^2].
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
The owner of the Burger Doodle Resturant is considering two ways to expand operation: open a drive-up window or serve breakfast. Th increase in profits reulting from theise proposed expansions depend on weather a competitor opens franchise down th..
in answering a question on a multiple-choice test a student either knows the answer or guesses. let p be the
The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston.
Find the probability that the number who considers themselves baseball fans is (a) exactly eight (b)at least eight and (c) less than eight. If possible use technology to find the probabilities.
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
given a sample size of 65 with sample mean 726.2 and sample standard deviation 85.3we perform the following hypothesis
The standard deviation of their rents is $80. (a) What is the standard error of the mean? (b) What are the degrees of freedom for a one-sample t statistic?
equation of the regression line.using the age and sick days data age x182639485358sick daysy16129562anbsp find the
Use confidence intervals to determine whether or not (a) we can be 95% certain that the average woman considers herself overweight as compared to her ideal weight.
Suppose the population standard deviation is 0.3 minutes and the sample mean is 9.975. A 90-percent confidence interval for the true mean delivery time is?
In an effort to counteract student cheating, the professor of a large class created four versions of a midterm exam, distributing the four versions among the students in the class.
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