Question

find the equation of the regression line
X 44 49 48 45 53 51
Y 108 134 117 124 127 118

using Ti84 calculator

Answer 1

Solution:

Given:

X 44 49 48 45 53 51
Y 108 134 117 124 127 118

We use TI-84 calculator to find the equation of the regression line.

Use following steps:

Press STAT and select EDIT

Under EDIT select L1 column, ( delete all old numbers) and Enter X values under L1

and select L2 column, ( delete all old numbers) and Enter Y values under L2

Now again press STAT

Select CALC

Under CALC, select LinReg(ax+b)

XList: L1

YList: L2

L1 and L2 are already there, but if not

press 2ND and 1 for L1 and 2ND and 2 for L2

freqList: keep blank

Now click on Calculate and press Enter

y = ax + b

a = 1.2865

b = 59.1517

thus

y = 1.2865 * x + 59.1517

which can written as:

y = 59.1517 + 1.2865 * x