Chapter 14.4, Problem 35E

(a)

To determine

To calculate: The linear equation of the line that is the best fit for the data using linear regression, with x equal to the number of years past 2000. Report the model with 3 significant digits. The world population in billion is tabulated below for their respective years.

Years	Population (in billions)
$2000$	$6.08$
$2010$	$6.82$
$2020$	$7.54$
$2030$	$8.18$
$2040$	$8.72$
$2050$	$9.19$

(b)

To determine

To calculate: The population in 2025. The world population in billion is tabulated below for their respective years.

Years	Population (in billions)
$2000$	$6.08$
$2010$	$6.82$
$2020$	$7.54$
$2030$	$8.18$
$2040$	$8.72$
$2050$	$9.19$

(c)

To determine

The interpretation of the slope of the best fit line. The table gives the actual or projected world population in billions for selected years from 2000 to 2050.

Years	Population (in billions)
$2000$	$6.08$
$2010$	$6.82$
$2020$	$7.54$
$2030$	$8.18$
$2040$	$8.72$
$2050$	$9.19$