~x(n) (32) i=1 Exercise 11. Suppose X1, X2,.,Xn is an i.i.d. sample of observations of a random variable X ~ N(u, o2), and X is the sample mean. Show that (X – µ)² ~x°(1) (33) o2 Take care to give a complete explanation, using only those results that have been established! 14
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- * Let X1, X2, ..., X, be an independent sam- ple from a normal distribution with unknown mean u and variance o?. Show that the pair (X,5), where X=-Ex,. 5 =(x, - X)'. i=1 is a sufficient statistic for (u, o²). Given A> 0, consider AS as an estimator of o². For what values of A is AS (i) (ii) unbiased? maximum likelihood, Which value of A minimises the mean square error E(A5³ – o*)?Let X₁, ..., X be a random sample from a gamma distribution with a x = 2 and 3 = = 0. '1' 1. Find the simplified likelihood of 0 given x: L(01x). 2. Find the maximum likelihood estimator of 0,0 MLE* is unbiased. 3. Show that the value you found for 0 MLE= 16. A simple random sample of size n = 64 is obtained from a population with u = 77 and o = (a) Describe the sampling distribution of x. (b) What is P (x>79.5) ? (c) What is P (xs72.9)? (d) What is P (75.9 79.5) = (Round to four decimal places as needed.) (c) P (xs72.9) = (Round to four decimal places as needed.) (d) P (75.9Please help me for Question 12. Let Y₁, Y₂, Y3, Y4, Y5 and X₁, X₂, ..., X, be independent and normally distributed random samples from populations with means μ₁ = 2 and μ₂ = 8 and variances ₁² = 5 and ₂² = k₁ respectively. Suppose that P(X-Ỹ > 10) = 0.02275, find the value of 0₂² = k. (5) Suppose that Y. Y y and X. X. X are independent normally distributed randomDraw all possible samples each of size 2 from the population 2, 4, 6 and 8 using sampling with replacement. Find mean of each sample and verify that (6) Mean of = u and (ii) V(X) (ii) V(R) %3DWhen dealing with an unbiased estimator of population variance how should we define S^2?Q 4.1. Suppose X and Y are independent random variables, which are jointly continuous. 1. Show carefully that the distribution of ‘X + Y given X = x' is equal to the distribution of the random variable x + Y. Hint: Consider the change of variables h(x, y) = (x,x+y).9. (8') Let X,, X,, X, be a sample of size n=3 from a distribution with unknown mean u, -0 < u<0, where the variance o is a known positive number. Show that both à =i and ê, = 2X, + X, +5X, are unbiased estimators for H.Suppose Y1, Y2, ,Y, is an iid sample from a N(4, o') population distribution. Let Y and S' denote the sample mean and sample variance, respectively. Let Q1 =0 (n – 1)S2 Q2 %3D Using the mgf technique determine the distribution of Qž + Q2.If we let X1, X2,...X10 be a random sample from the distribution N( μ, σ), then what is the value k so that: P( (X-μ)/(σ/√10) < k ) = .05 P( (X-μ)/(S/√10) < k ) = .05 P( k < (X-μ)/(S/√10) ) = .056SEE MORE QUESTIONS