Assignment 3

# Assignment 3 - Assignment#3 STAT331/361/SYDE334 Winter 2007...

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Assignment #3, STAT331/361/SYDE334 Winter 2007 This assignment is to be handed in at the start of the lecture of Thursday 1st March, 07 . For some problems required the application of R software, you need to cut and paste results (either numeric or graphic) into Word, which can then edited, commented on and handed in. DO NOT hand in R code, or a print out of the R session, unless asked for. Problem 1 : Consider the cardiovascular ±tness data set given in Problem 4 of Assignment #2. Use R software to solve the following questions: (a) Compute 95% con±dence interval on the mean response E ( Y | x ) when x = 900. Interpret the meaning of this interval estimation. (b) Compute 95% prediction interval for x = 900. Interpret the meaning of this prediction interval. (c) Plot both 95% con±dence intervals on the mean response E ( Y | x ) and prediction intervals for the data around the ±tted line. Comment on their relative positions. (d) Plot the residuals against the explanatory variable. Comment on the appropriateness of the

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Assignment 3 - Assignment#3 STAT331/361/SYDE334 Winter 2007...

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