3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and...

3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and Y1...Xn independent of each other. Assume that the common population SD σ is known but the two means are not. Consider testing the hypothesis null: μx = μy vs alternative: μx ≠ μy.

d. Assume σ=1 and n=20. How large must δ be for the size 0.01 test to have power at least 0.99?

e. Assume σ=1and δ=0.2. How large must n be for the size 0.01 test to have power at least 0.99?

Expert Solution

Minitab output:

1-Sample Z Test

Testing mean = null (versus not = null)
Calculating power for mean = null + difference
Alpha = 0.01 Assumed standard deviation = 1.4142

Sample
Size Power Difference
20 0.99 1.55019

(e)

Minitab output:

Power and Sample Size

1-Sample Z Test

Testing mean = null (versus not = null)
Calculating power for mean = null + difference
Alpha = 0.01 Assumed standard deviation = 1.4142

Sample Target
Difference Size Power Actual Power
0.2 1202 0.99 0.990025

orchestra answered 2 years ago

3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and...

3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and Y1...Xn independent of each other. Assume that the common population SD σ is known but the two means are not. Consider testing the hypothesis null: μx = μy vs alternative: μx ≠ μy. a. Find the likelihood ratio test statistic Λ. Specify which MLEs you are using and how you plug them in.

1. . Let X1, . . . , Xn, Y1, . . . , Yn be...

1. . Let X1, . . . , Xn, Y1, . . . , Yn be mutually independent random variables, and Z = 1 n Pn i=1 XiYi . Suppose for each i ∈ {1, . . . , n}, Xi ∼ Bernoulli(p), Yi ∼ Binomial(n, p). What is Var[Z]? 2. There is a fair coin and a biased coin that flips heads with probability 1/4. You randomly pick one of the coins and flip it until you get a...

Let X1,X2,...,Xn and Y1,Y2,...,Ym be independent random samples drawn from normal distributions with means μX and...

Let X1,X2,...,Xn and Y1,Y2,...,Ym be independent random samples drawn from normal distributions with means μX and μY , respectively, and with the same 2 known variance σ . Use the generalized likelihood ratio criterion to derive a test procedure for choosing between H0:μX =μY and H1:μX not equal to μY.

Let X1,...,Xn be iid N(μ , σ^2) with μ known and σ^2 unknown. Please carefully re-read...

Let X1,...,Xn be iid N(μ , σ^2) with μ known and σ^2 unknown. Please carefully re-read that sentence, as it is an uncommon setup! (a) Find the Cramer-Rao lower bound for an unbiased estimator of σ^2. (b) The MLE for σ^2 is ∑(xi−μ)^2 / n. Find the variance of this estimator. You may find use of the following property: E[(X−μ)^4] = 3σ^4. c) Find the efficiency of the MLE. Is it a MVUE? Explain.

Let X1, X2, . . . , Xn iid∼ N (µ, σ2 ). Consider the hypotheses...

Let X1, X2, . . . , Xn iid∼ N (µ, σ2 ). Consider the hypotheses H0 : µ = µ0 and H1 : µ (not equal)= µ0 and the test statistic (X bar − µ0)/ (S/√ n). Note that S has been used as σ is unknown. a. What is the distribution of the test statistic when H0 is true? b. What is the type I error of an α−level test of this type? Prove it. c. What is...

Question

3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and...

Solutions

Expert Solution

Related Solutions

3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and...

1. . Let X1, . . . , Xn, Y1, . . . , Yn be...

Let X1,X2,...,Xn and Y1,Y2,...,Ym be independent random samples drawn from normal distributions with means μX and...

Let X1,...,Xn be iid N(μ , σ^2) with μ known and σ^2 unknown. Please carefully re-read...

Let X1, X2, . . . , Xn iid∼ N (µ, σ2 ). Consider the hypotheses...

Let X1, . . . , Xn ∼ iid N(θ, σ2 ), with one-sided hypotheses H0...

Let X1, X2, · · · , Xn be iid samples from density: f(x) = {θx^(θ−1),...

) Let X1, . . . , Xn be iid from the distribution with parameter η...

Let X1,…, Xn be a sample of iid N(0, ?) random variables with Θ=(0, ∞). Determine...

Consider a random sample (X1, Y1), (X2, Y2), . . . , (Xn, Yn) where Y...