(Q2) Suppose Y₁,..., Y, are mutually independent random variables such that for a given Xi Y~N(a+BXi, o²), i=1,...,n. where a, ẞ and the variance o² are unknown. Unbiased estimators â, 3, 52 of a, 3, 02 are â=Y-BX, ẞ=S, S²=; B= Sxx' 1 n-2 i=1 (X-&-BX;)², where we have denoted Sry=XY(X) (Y). It is known that - T= B-B S/√√STE ~tn-2- Let c>0 be a constant such that P(|T|> c) = 0.05 where T~tn−2. (i) Show that the 95% confidence interval for ẞ is given by S (ii) Suppose we observe the following data: X 70, 74, 72, 68, 58, 54, 82, 64, 80, 61 Y 77, 94, 88, 80, 71, 76, 88, 80, 90, 69 Calculate, ẞ, S² from the data. (iii) Calculate the 95% confidence interval for ẞ.

(Q2) Suppose Y₁,..., Y, are mutually independent random variables such that for a given Xi Y~N(a+BXi, o²), i=1,...,n. where a, ẞ and the variance o² are unknown. Unbiased estimators â, 3, 52 of a, 3, 02 are â=Y-BX, ẞ=S, S²=; B= Sxx' 1 n-2 i=1 (X-&-BX;)², where we have denoted Sry=XY(X) (Y). It is known that - T= B-B S/√√STE ~tn-2- Let c>0 be a constant such that P(|T|> c) = 0.05 where T~tn−2. (i) Show that the 95% confidence interval for ẞ is given by S (ii) Suppose we observe the following data: X 70, 74, 72, 68, 58, 54, 82, 64, 80, 61 Y 77, 94, 88, 80, 71, 76, 88, 80, 90, 69 Calculate, ẞ, S² from the data. (iii) Calculate the 95% confidence interval for ẞ.

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E

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