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Let X1,...,Xn be independent normal random variables, each with unit variance, and with E[Xi] = alpha * ti + beta * (ti)^2, i = 1,...,n, where alpha and beta are unknown parameters and t1,...,tn are known constants. What is the MLE estimate for alpha and beta?
Many studies have investigated methods of reducing anxiety and depression.- The numbers are the students' improvement scores after 10 weeks. Analyze the data and write a conclusion.
Let TA, TB, and Tc be the failure times of components A, B, and C. Assume these are independent exponential random variables with rates a, ß, and ?.
Aw, nuts! A company claims that each batch of its deluxe mixed nuts contains 52% cashews, 27% almonds, 13% macadamia nuts, and 8% brazil nuts.
Suppose all 120 employees (70 males and 50 females) of a company were asked whether they are in favor or oppose paying high salaries to CEOs of Wall Street
a researcher conducted a study that examined the proportion of high school students who cheated on tests at least twice
What is the probability that a randomly selected ringtone from this list is not Empire State of Mind and not I Gotta Feeling? Be sure to show how you computed this answer.
What can we conclude from these figures at a level of significance of .01?
let x be a binomial random variable with p0.5 and n10. calculate the following probabilities from the binomial
Find the mean and the variance of the hypergeometric distribution with n = 3, N = 16, and M = 10, using (a) the results of Exercise 64;
Does a z-score identify an exact location in a distribution with a single number? Why or why not?
Suppose that we collect data on "hours of sleep last night" from 64 students who are present at an 11:00 A.M. statistics class.- Calculate the confidence interval.
The rise of gasoline prices along with record profits at Exxon-Mobile produced stories of corporate greed. How could you use a statistical model to explain the rise of prices at the pump?
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