ec6 - The University of Hong Kong Department of Statistics...

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1 The University of Hong Kong Department of Statistics and Actuarial Science STAT0302 Business Statistics Semester 2 2009/2010 Example Class 6 Question 1. The following data show the average number of hours which six students studied per week and their grade-point index: x : Hours studied 15 28 13 20 4 10 y : Grade-point index 1.0 2.7 1.3 1.9 0.9 1.7 (a) Find the line of best fit for these data using: (i) the formulae, (ii) calculator. (b) Plot the data and draw the regression line on the same scatter diagram. (c) Predict the grade point index for a student who studies 20 hours per week. (d) Predict the grade point index for a student who studies zero hours per week. (e) Which prediction is more reliable (c) or (d)? Why? (f) Calculate the correlation coefficient using: (i) the formulae, (ii) calculator. (g) Calculate the Spearman rank correlation. 2. The monthly temperature and gas consumption between Jan 1997 to Dec 2000 in
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This note was uploaded on 05/02/2010 for the course STAT STAT0302 taught by Professor Prof.chiu during the Spring '09 term at HKU.

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ec6 - The University of Hong Kong Department of Statistics...

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