Attendance

Questions?

ANNOUNCEMENTS & ASSIGNMENTS:

NEXT EXAM three weeks away: March 27.  Mark your calendars.

Website of the Week:  Stumble Upon preference picks example.  Photosynth TED talk by Blaise Aguera y Arcas)

Preview of Lab Next Two Weeks:
This week:  Excel Lab 2 with scatter plot and population pyramid graphs
Next Week: Build your Web Page

Reading: Voyager II article, Sci. Am. Nov. 1986  Optical fibers,
 Text Sections 9-10 (pages 54-63)

LECTURE:

Text as Binary: the ASCII code

Review Graph Practice Two

        Demographic Transitions: One, Two

        Orchards

        Election Results

Descriptive Statistics: Handout

    Mean: the numerical average, used with quantitative data.

    Mode: the most often observed value, used with qualitative as well as quantitative data.

    Median: The mid-point or middle, used with quantitative continuous data.

    Variation: Often more important than the Mean and shown in: Histogram,
                    Inter-quartile range, Box & Whiskers plot, Variance,
                    & Standard Deviation.

Graph Practice Three