The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let t be the number of years since 1920, (so t=0 represents the year 1920). (a) Find the equation of the regression line. Average life expectancy, ?(t)= NOTE: this is a function of t (not x). (b) Estimate the average life expectancy in the United States in the year 1953 according to the linear model in part (a). Average life expectancy in 1953=

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The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let t be the number of years since 1920, (so t=0 represents the year 1920).

(a) Find the equation of the regression line.

Average life expectancy, ?(t)=

NOTE: this is a function of t (not x).

(b) Estimate the average life expectancy in the United States in the year 1953 according to the linear model in part (a).

Average life expectancy in 1953= 

Year
Life expectancy
1920 1930 1940 1950 1960 1970 1980 1990
57.3 58.8 62 65.5 69.2 70.5 73.7 76.2
Transcribed Image Text:Year Life expectancy 1920 1930 1940 1950 1960 1970 1980 1990 57.3 58.8 62 65.5 69.2 70.5 73.7 76.2
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