The percent of U.S. households with telephone
landlines has decreased at a roughly linear rate, as shown by
the following table.

(a) Find the equation of the least squares line, letting x equal the number of years since 2000.

(b) Based on your answer to part (a), at approximately what rate is the percent of households with landlines decreasing per year?

(c) Use your result from part (a) to predict the percent of households with landlines in the year 2024.

(d) If this trend continues linearly, in what year will the percent of households with landlines first dip below 20%?

(e) Find and interpret the correlation coefficient.

Transcribed Image Text:

Percent of Year Households 2013 58.1 2014 53.3 2015 49.3 2016 47.5 2017 43.8 2018 41.7