This data set was downloaded from the site http://lib.stat.cmu.edu/DASL/ at
Carnegie-Melon university. The original source is Willerman et al. (1991). The
data consist of a sample of brain information recorded on 40 college students.
The variables include gender, height, weight, three IQ measurements, and
Magnetic Resonance Imaging (MRI) counts, as a determination of brain size. The
data are in the rda file braindata. rda at the sites referenced in the
Preface. For this exercise, consider the MRI counts.
(a) Load the rda file braindata.rda and print the MRI data, using the code:
\(\mathrm{mri}<-\) braindata \([, 7] ;\) print(mri).
(b) Obtain a histogram of the data, hist \((m r i, p r=T)\). Comment on the
shape.
(c) Overlay the default density estimator, lines (density(mri)). Comment on
the shape.
4.1.10. This data set was downloaded from the site
http://lib.stat.cmu.edu/DASL/ at Carnegie-Melon university. The original
source is Willerman et al. (1991). The data consist of a sample of brain
information recorded on 40 college students. The variables include gender,
height, weight, three IQ measurements, and Magnetic Resonance Imaging (MRI)
counts, as a determination of brain size. The data are in the rda file
braindata. rda at the sites referenced in the Preface. For this exercise,
consider the MRI counts.
(a) Load the rda file braindata.rda and print the MRI data, using the code:
\(\mathrm{mri}<-\) braindata \([, 7] ;\) print(mri).
(b) Obtain a histogram of the data, hist \((m r i, p r=T)\). Comment on the
shape.
(c) Overlay the default density estimator, lines (density(mri)). Comment on
the shape.
