STAT 2040 Chapter Notes - Chapter 1: Blood Lead Level, Box Plot, Summary Statistics

• School: University of Guelph
• Department: Statistics
• Course: STAT 2040
• Professor: Ayesha Ali

Document Summary

Plots and numerical summaries are used to describe a set. Consider a data set representing final grades in a large introductory statistics course. The grades are visual representing using a histogram (a) or a boxplot(b) Box plots are plots of the five number summary: minimum, 25th percentile, median, 75th percentile and maximum. Boxplots are most usefully for comparing two or more distributions. These plots give a visual summary of the data. This question was investigated by drawing random blood samples of 126 cairo traffic officers and 50 officers from the suburbs to measure the lead levels in their blood. The summary statistics are represented in the table and boxplot below. Estimating the difference in blood lead levels between the two groups. Testing if the observed difference is statistically significant. Statistically significant: a difference of size that is unlikely to observe. This study was done with 44 male students who were randommly assigned to one of 4 groups.