PRACTICE QUESTION PART 2
1. The height of a child increases at a rate given in the table below. Fit the straight line using
the method of least-square and calculate the average increase and the standard error of
estimate.
Month
Height
1
52.5
2
58.7
3
65
4
70.2
5
75.2
6
81.1
7
87.2
8
95.5
9
102.2
10
108.4
2. Given X = 4Y+5 and Y = KX + 4 are the lines of regression of X on Y and of Y on X respectively.
If k is positive, prove that it cannot exceed 1/4. If k = 1/16, find the means of the two
variables and coefficient of correlation between them.
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