Stats: Modeling the World Nasta Edition Grades 9-12
Stats: Modeling the World Nasta Edition Grades 9-12
3rd Edition
ISBN: 9780131359581
Author: David E. Bock, Paul F. Velleman, Richard D. De Veaux
Publisher: PEARSON
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Chapter 9, Problem 30E
To determine

To create a model that describe this trend and justify decisions you make how to best use these data.

Expert Solution & Answer
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Explanation of Solution

The national center of health statistics reported the data below, showing the percentage of all births that are to unmarried women for selected years between 1980 and 1998 . Now, we have to create the model for these data. So, the data of percentage of unmarried women given in the question is as:

    Year 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998
    % 18.4 22 28 29.5 30.1 31 32.6 32.2 32.4 32.4 32.8

Thus, the model can be separated into two parts as we can see from the data that the slope of 19801994 is much larger than the slope of the years between 19941998 as they have straight form of points. The scatterplot of the two data sets form are as follows:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 9, Problem 30E , additional homework tip  1

And the second scatterplot is as:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 9, Problem 30E , additional homework tip  2

Thus for both the unmarried women percentages in on the vertical axis and the years is on the horizontal axis.

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