The table below shows the life expectancy for an individual born in the United States in certain years

.Year of Birth Life Expectancy

1930 59.7

1940 62.9

1950 70.2

1965 69.7

1973 71.4

1982 74.5

1987 75

1992 75.7

2010 78.7

1. Calculate the least-squares line. Put the equation in the form of=a+bx.

(Round your answers to three decimal places.) =+x

2. Find the correlation coefficientr. (Round your answer to four decimal places.)

r=

3.Find the estimated life expectancy for an individual born in1950and for one born in2010. (Round your answers to one decimal place.)

Birthdate in1950:

Birthdate in2010:

4.Using the least squares line, find the estimated life expectancy for an individual born in1830. (Round your answer to one decimal place.)

5.What is the slope of the least-squares (best-fit) line? (Round your answer to three decimal places.)

6.Interpret the slope. (Round your answer to three decimal places.)