1/19/2011

Introduction to R

• Reading data from a file - importing Excel files
• Viewing the data
• Sorting data
• Descriptive statistics for the pulse data
• Graphical displays for the pulse data

Chapter 0

• Review of statistical inference
  • Null hypothesis
  • Alternative hypothesis
  • Hypothesis test
  • Sampling distribution
  • Critical region
  • Significance level
  • Type I and Type II errors
  • Null distribution
  • P-value
• Confidence intervals for a population mean
  • When the population standard deviation is known (not useful)
  • When the population standard deviation is unknown (t interval)
  • Interpreting CIs
• One sample inference for a mean
  • The time to repair an electronic instrument is a normally distributed random variable measured in hours. The repair times for 16 such instruments are: 159, 280, 101, 212, 224, 379, 179, 264, 222, 362, 168, 250, 149, 260, 485, and 170. Does it seem reasonable that the true mean repair time is greater than 225 hours? Use 0.05 as your significance level.
• Two sample t-test
  • Return to pulse data set from day 1 and compare the resting pulses for men and women.

Please complete your reading of Chapter 0 for class on Friday