Using R for Introductory Statistics : John Verzani

Bivariate data 79Figure 3.5 Six qqnorm() graphs fordifferent types of datacontrol =="C" are not using a cell phone, and those with control =="T" are. Their time torespond to some external event is recorded in seconds.Create side-by-side boxplots of the variable react ion. time for the two values ofcontrol. Compare the centers and spreads.3.9 For the data set twins (UsingR) make a boxplot of the Foster and Biologicalvariables. Do they appear to have the same spread? The same center?3.10 The data set stud. recs (UsingR) contains 160 SAT scores for incoming collegestudents stored in the variables sat.v and sat.m. Produce sideby-side densityplots of thedata. Do the two data sets appear to have the same center? Then make a quantile-quantileplot. Do the data sets appear to have the same shape?3.11 For the data set morley, make a boxplot of the Speed variable for Expt ==1 andExpt ==2. These data sets are the measurements of the speed of light for two differentexperiments. Do they appear to have the same spread? The same center?3.12 The data set normtemp (UsingR) contains normal body temperaturemeasurements for 130 healthy individuals recorded in the variable temperature. Thevariable gender is 1 for a male subject and 2 for a female subject. Break the data up bygender and create side-by-side boxplots. Does it appear that males and females havesimilar normal body temperatures?