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Question. Consider a random sample X11-X12. . . . , Xini with ni-10 from N2(μ, Σ) and a random sa...
I want ONLY 8.3 answered (I already did 8.2) I want ONLY 8.3 answered (I already...
I want ONLY 8.3 answered (I already did 8.2)
I want ONLY 8.3 answered (I already did 8.2)
8.2. Use Theorem 4.14 on page 135 and its corollary to show that if X11, X12,... ,X1n,X21, X22,... ,X2n2 are independent random variables, with the first ni constitut- ing a random sample from an infinite population with the mean μ and the variance σ. and the other n2 constitut- ing a random sample from an infinite population with the mean μ2 and...
QUESTION 2 Let Xi.. Xn be a random sample from a N (μ, σ 2) distribution,...
QUESTION 2 Let Xi.. Xn be a random sample from a N (μ, σ 2) distribution, and let S2 and Š-n--S2 be two estimators of σ2. Given: E (S2) σ 2 and V (S2) - ya-X)2 n-l -σ (a) Determine: E S2): (l) V (S2); and (il) MSE (S) (b) Which of s2 and S2 has a larger mean square error? (c) Suppose thatnis an estimator of e based on a random sample of size n. Another equivalent definition of...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume s12 > 0, and someone ignores this positive correlation and takes the wrong sample covariance 811 0 0 822 ill this person derive a wider or narrower 95% confidence interval of μ-μ2 than the correct one? Explain.
Question 6 are Consider a...
9.6 in order to compare the means of two populations, inde- NW pendent random samples of 400 observations are selected from each population, with the following results Sample 1 Sample 2 $.240 s2 200...
9.6 in order to compare the means of two populations, inde- NW pendent random samples of 400 observations are selected from each population, with the following results Sample 1 Sample 2 $.240 s2 200 5,275 1150 a. Use a 95% confidence interval to estimate the dif- ference between the population means (μ,-μ Interpret the confidence interval. b. Test the null hypothesis Ho (μι-μ)--0 versus the c. Suppose the test in part b were conducted with the d. Test thenull hypothesis...
Suppose that independent samples of sizes n1, n2, . . . , nk are taken from each of k normally di...
Suppose that independent samples of sizes n1, n2, . . . , nk are taken from each of k normally distributed populations with means μ1,μ2, . . . , μk and common variances, all equal to σ 2. Let Yi j denote the j th observation from population i, for j = 1, 2, . . . , ni and i = 1, 2, . . . , k, and let n = n1 + n2 + ··· + nk...
Question 5 Suppose we have the following two samples , rini from No(21, Σ), Sample l: r1 1, Sample 2: T21 , . . . , z2n2 from MgWa, Σ 2). Two new = C2, + d for all 1-1,2 and j = 1, 2, . . . ,n, where...
Question 5 Suppose we have the following two samples , rini from No(21, Σ), Sample l: r1 1, Sample 2: T21 , . . . , z2n2 from MgWa, Σ 2). Two new = C2, + d for all 1-1,2 and j = 1, 2, . . . ,n, where C is a p x p nonsingular matrix and d is a p x 1 vector. Based on Samples and 2, the T2-statistic for testing μι μ2 is denoted as...
5. (worth 16 points) Consider a test of H : μ-65 versus Ha μ > 65. The test uses σ-10, α-01 size of n 64. and a samp...
5. (worth 16 points) Consider a test of H : μ-65 versus Ha μ > 65. The test uses σ-10, α-01 size of n 64. and a sample a. Describe the sampling distribution of Fassuming Ho is true. Mean (t)- Standard deviation (oz)- Shape: Sketch the sampling distribution of x assuming Ho is true is used as the test stat istic. Locate the rejection region on your graph from b. Specify the rejection region when x part a. C. Describe...
FR2 (4+4+4 12 points) (a) Let XI, X2, X10 be a randoin sample from N(μι,σ?) and Yi, Y2, 10 , Y 15 be a random sample from N (μ2, σ2), where all parameters are unknown. Sup- pose Σ 1 (Xi X 2 0 321 (Y-...
FR2 (4+4+4 12 points) (a) Let XI, X2, X10 be a randoin sample from N(μι,σ?) and Yi, Y2, 10 , Y 15 be a random sample from N (μ2, σ2), where all parameters are unknown. Sup- pose Σ 1 (Xi X 2 0 321 (Y-Y )2-100. obtain a 99% confidence interval for σ of having the form b, 0o) for some number b (No derivation needed). (b) 60 random points are selected from the unit interval (r:0 . We want...
Independent random samples selected from two normal populations produced the sample means and standard dev atons...
Independent random samples selected from two normal populations produced the sample means and standard dev atons shown to the right. a. Assuming equal variances, conduct the test Ho: (μι-μ2)-U against Ha: μι-μ2) #0 using α .10. b. Find and interpret the 90% confidence interval for(μ1-μ2) Sample 1 Sample 2 x1 59 x2-7.9 13 2-4.8 a. Find the trst statistic. The test statistic is Round to two decimal places as needed.) ind the p vaue. The p-value is Round to three...
come from populations (1 point) Test t mean. Assume that the samples are independent simple random samples. Use a significance level of a 0.01 Sample 1: n1 15, 1-28.4, 81-6.07 Sample 2: n2 10, 2 22,...
come from populations (1 point) Test t mean. Assume that the samples are independent simple random samples. Use a significance level of a 0.01 Sample 1: n1 15, 1-28.4, 81-6.07 Sample 2: n2 10, 2 22, 82 8.92 (a) The degree of freedom is (b) The standardized test statistic is (c) The final conclusion is O A. We can reject the null hypothesis that (14-Ha) 0 and accept that (M1-μ2) 0 B. There is not sufficient evidence to reject the...
I want ONLY 8.3 answered (I already did 8.2)
I want ONLY 8.3 answered (I already did 8.2)
8.2. Use Theorem 4.14 on page 135 and its corollary to show that if X11, X12,... ,X1n,X21, X22,... ,X2n2 are independent random variables, with the first ni constitut- ing a random sample from an infinite population with the mean μ and the variance σ. and the other n2 constitut- ing a random sample from an infinite population with the mean μ2 and...
QUESTION 2 Let Xi.. Xn be a random sample from a N (μ, σ 2) distribution, and let S2 and Š-n--S2 be two estimators of σ2. Given: E (S2) σ 2 and V (S2) - ya-X)2 n-l -σ (a) Determine: E S2): (l) V (S2); and (il) MSE (S) (b) Which of s2 and S2 has a larger mean square error? (c) Suppose thatnis an estimator of e based on a random sample of size n. Another equivalent definition of...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume s12 > 0, and someone ignores this positive correlation and takes the wrong sample covariance 811 0 0 822 ill this person derive a wider or narrower 95% confidence interval of μ-μ2 than the correct one? Explain.
Question 6 are Consider a...
9.6 in order to compare the means of two populations, inde- NW pendent random samples of 400 observations are selected from each population, with the following results Sample 1 Sample 2 $.240 s2 200 5,275 1150 a. Use a 95% confidence interval to estimate the dif- ference between the population means (μ,-μ Interpret the confidence interval. b. Test the null hypothesis Ho (μι-μ)--0 versus the c. Suppose the test in part b were conducted with the d. Test thenull hypothesis...
Question 5 Suppose we have the following two samples , rini from No(21, Σ), Sample l: r1 1, Sample 2: T21 , . . . , z2n2 from MgWa, Σ 2). Two new = C2, + d for all 1-1,2 and j = 1, 2, . . . ,n, where C is a p x p nonsingular matrix and d is a p x 1 vector. Based on Samples and 2, the T2-statistic for testing μι μ2 is denoted as...
5. (worth 16 points) Consider a test of H : μ-65 versus Ha μ > 65. The test uses σ-10, α-01 size of n 64. and a sample a. Describe the sampling distribution of Fassuming Ho is true. Mean (t)- Standard deviation (oz)- Shape: Sketch the sampling distribution of x assuming Ho is true is used as the test stat istic. Locate the rejection region on your graph from b. Specify the rejection region when x part a. C. Describe...
FR2 (4+4+4 12 points) (a) Let XI, X2, X10 be a randoin sample from N(μι,σ?) and Yi, Y2, 10 , Y 15 be a random sample from N (μ2, σ2), where all parameters are unknown. Sup- pose Σ 1 (Xi X 2 0 321 (Y-Y )2-100. obtain a 99% confidence interval for σ of having the form b, 0o) for some number b (No derivation needed). (b) 60 random points are selected from the unit interval (r:0 . We want...
Independent random samples selected from two normal populations produced the sample means and standard dev atons shown to the right. a. Assuming equal variances, conduct the test Ho: (μι-μ2)-U against Ha: μι-μ2) #0 using α .10. b. Find and interpret the 90% confidence interval for(μ1-μ2) Sample 1 Sample 2 x1 59 x2-7.9 13 2-4.8 a. Find the trst statistic. The test statistic is Round to two decimal places as needed.) ind the p vaue. The p-value is Round to three...
come from populations (1 point) Test t mean. Assume that the samples are independent simple random samples. Use a significance level of a 0.01 Sample 1: n1 15, 1-28.4, 81-6.07 Sample 2: n2 10, 2 22, 82 8.92 (a) The degree of freedom is (b) The standardized test statistic is (c) The final conclusion is O A. We can reject the null hypothesis that (14-Ha) 0 and accept that (M1-μ2) 0 B. There is not sufficient evidence to reject the...
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