Let x1, x2, , xn be a random sample of size n from the exponential distribution whose pdf is f(x; θ) = (1/θ)e−x/θ , 0 < x < [infinity], 0 < θ< [infinity].(a) show that x is an unbiased estimator of θ.(b) show that the variance of x is θ 2/n.(c) what is a good estimate of θ if a random sample of size 5 yielded the sample values 3.5, 8.1, 0.9, 4.4, and 0.5?

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true

Which of the following represents the factorization of the trinomial below? x^2+7x-30

What is the solution for 6 - 7/8? explain the steps.