# An investigator wants to use a straight line to predict IQ from lead levels in the blood, for a...

## Question:

An investigator wants to use a straight line to predict IQ from lead levels in the blood, for a representative group of children aged 5-9. There is a weak positive association in the data.

True or false, and explain-

a) He can use many different lines

b) He has to use the regression line

c) only the regression line has an r.m.s. error

d) any line he uses will have an r.m.s. error

e) among all lines, the regression line has the smallest r.m.s error

## Regression line:

Regression line is best fit straight line,so for predicting the dependent variable,he should utilize regression line,

Some other line can have RMS error,but regression line have smallest RMS error.

## Answer and Explanation:

a)

The Given statement is True.

He does not need to use regression line.

B)

The Given statement is False.

There are many ways to choose a line.

...

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