9/4/2009

Questions on the In Class Exercises from Wednesday

• Discussion of Exercise #8 (See p. 104)

Descriptive Statistics

• Measuring Center
  • Mean
  • Median
  • Trimmed Mean
• Measuring Spread or Variability
  • Range
  • Interquartile range
  • Variance
  • Standard Deviation
• Measuring Position
  • Percentiles
  • Five-number Summary
  • Boxplot
  • Standardized Scores
• Identifying Outliers
  • 1.5 x IQR Criterion
  • 2 or 3 standard deviations away from the mean

In Class Exercises

The responses on the data collection cards can be found in the file p:\data\math\stats\Day1 F2009.mtw. Use this file for the first four exercises below.

1. Compare the amount of coins carried by the two different sections using descriptive statistics and at least two different graphical displays.
2. Compare the pulses for men and women using descriptive statistics and at least two different graphical displays.
3. Are there any outliers according to the 1.5xIQR criterion for the variable coins? amount of reading?
4. Are women better at guessing the length of the white (black) string than men? Explain.