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Decide which variable should be the independent variable

Qusetion: Table shows the life expectancy for an individual born in the United States in certain years.

a. Decide which variable should be the independent variable and which should be the dependent variable.

b. Draw a scatter plot of the ordered pairs.

c. Calculate the least squares line. Put the equation in the form of: y = a + bx

d. Find the correlation coefficient. Is it significant?

e. Find the estimated life expectancy for an individual born in 1950 and for one born in 1982.

f. Why aren't the answers to part e the same as the values in Table that correspond to those years?

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Basic Statistics: Decide which variable should be the independent variable

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