Lectures: Stat 202 Soc Poly Fall 2016

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August 29, 2016

August 31, 2016

September 1, 2016

  • Today, after a review, we covered bar graphs, pie charts and stemplots, and histograms for visualizing distributions.
  • Homework: I passed out and we worked on Homework 1, due September 8, 2016.
  • Homework: I passed out and we worked on Homework 2, due September 8, 2016.
  • Homework: I passed out but did not yet assign Homework 3. Due date to be added later.
  • Reading: Moore, McCabe, Craig, pp 1-25.
  • Next class: We will cover Exploratory data analysis from The Data Professor's Guide to Basic Statistics. Homework 3 will be assigned, but instead of working on the histogram homework in class we will do a laboratory exercise on a diamonds data set. Finally, if there is time, we will proceed to talk about summary statistics (mean, median, quartiles, percentiles, 5 number summary, standard deviation) and the box plot and modified box plot.

September 7, 2016

  • Today we reviewed the concept of histograms with the call center data set. We talked about the axes of the histogram: the x-axis is the range of the values of the quantitative variable whose distribution is being visualized. This range can be restricted by adjusting the "where" input in StatCrunch. There are 3 choices for the y-axis in StatCrunch: frequency (the count of observations in each bin), the relative frequency (the proportion of observations in each bin) and the density. The point of the density was to have a vertical scale which is independent of the number of observations and bin width. We discussed exploratory data analysis and worked together to analyze the diamonds data set. Finally I introduced mean and median.
  • Homework: Homework 1 is due next class, September 8, 2016.
  • Homework: Homework 2 is due next class, September 8, 2016.
  • Homework: Homework 3 is now assigned with a due date of September 14, 2016.
  • Practice Problems: Practice Problems for Week 1.
  • Solutions to Practice Problems: Solutions to Practice Problems for Week 1.
  • Reading: Moore, McCabe & Craig, pp. 30-36.
  • Next class: We will discuss skewed and symmetric distributions, tails, center and spread, unimodal, multimodal, and bimodal distributions. We also will continue to discus mean and median, and introduce quartiles, and percentiles. We will discuss the distinction between resistant to outliers versus sensitive to outliers. We will continue our tour of summary statistics with the 5-number summary and the related box plot and modified box plots, we will pass out homework 4 and 5, talk about the sample standard deviation, and transformations. Then, if there is time we will proceed to talk about sampling -- to understand Bessel's correction in the definition of the sample standard deviation, but also because it is one of the primary course objectives.

September 8, 2016

  • Today, we discussed skewed and symmetric distributions, tails, center and spread, unimodal, multimodal, and bimodal distributions. We also discused mean and median, quantiles, and percentiles, resistant to outliers versus sensitive to outliers. We also continued our tour of summary statistics with the 5-number summary and the related box plot and modified box plots.
  • Homework: Homework 3 was already assigned with a due date of September 14, 2016.
  • Homework: Homework 4 was assigned today with a due date of September 15, 2016.
  • Reading: Moore, McCabe & Craig, pp. 37-42.
  • Next class: We will quickly review measures of center and spread, 5 number summary, box plot and modified box plot. We will cover transformations. We will have class time for Homework 5. We will cover standard deviation and start to study sampling.
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