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STA220: Practice of Statistics 1 Section L0301: Health & Life Sciences September 17, 2013

STA220: Practice of Statistics 1 Section L0301: Health & Life Sciences September 17, 2013. Announcement. TA office hours for this course start this week. They will be held in the Statistics Aid Centre: SS 1091. See Coursera for the schedule. From last class …. Your responses:.

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STA220: Practice of Statistics 1 Section L0301: Health & Life Sciences September 17, 2013

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  1. STA220: Practice of Statistics 1Section L0301: Health & Life SciencesSeptember 17, 2013

  2. Announcement • TA office hours for this course start this week. They will be held in the Statistics Aid Centre: SS 1091. See Coursera for the schedule.

  3. From last class …

  4. Your responses:

  5. Topicsthis week: • One variable statistics: five number summary, percentile, mean, trimmed mean, range, interquartile range (IQR), variance, standard deviation, z-score, frequency, relative frequency • One variable plots and shape: histogram, dot plot, boxplot, pie chart, bar chart, distribution, skew, modes • Types of variables: categorical, ordinal, quantitative • Two categorical variables: contingency tables (cross-tabulations or two-way tables) including marginal, joint, and conditional distributions; side-by-side and stacked bar plots (stacked bar plots for conditional distributions are sometimes called segmented bar plots); independent • Simpson's Paradox • Features of data and statistics: observations, observational units (cases), variables, missing values, outliers, robust statistics, the empirical rule

  6. Today and Thursday: • Muddiest point requests • Topics not in videos • A few problems

  7. Muddy points:

  8. Muddy points:

  9. Muddy points:

  10. A quartile question:

  11. Muddy points:

  12. Shape of distribution

  13. Percentiles Would you rather be in the 99th percentile or the 1st percentile of the class?

  14. The 99thpercentile is the value such that 99% of the data is less than it. • What is another name for: • The 25th percentile? • The 50th percentile? • The 75th percentile?

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