This table shows the percentage of females in the U.S. labor force at various times.

a. Find the least squares line for these data. Let x represent the year, and let y represent the percentage. (Use 1900 as the reference year.)
b. What is the real-world meaning of the slope? Of the y-intercept?
c. According to your model, what percentage of the current labor force is female? Check an almanac to see how accurate your prediction is.

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1950 1960 1970 1980 1990 2000 38. 42.5 45.3 52.0 Year Percentage 29.6 33.4