STAT 1350 Lecture Notes - Lecture 24: Cardiovascular Disease, Scatter Plot, Dependent And Independent Variables
27 Apr 2018
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Chapters 14 and 15: Describing Relationships
(Scatterplots, Correlation, Regression, and Prediction)
● Statistics in the News
○ Headline: “Happy Halloween! Kids who eat candy every day grow up to be
violent criminals” http://www.dailyfinance.com/story/happy-halloween-kids-
who-eat-candy-every-day-grow-up-to-be-viol/19181696/
■ A large study of nearly 17,500 participants in Britain found that 69
percent of the participants who had committed violence by age 34 had
eaten sweets or chocolate nearly every day during childhood.
■ Is the title to this article misleading?
■ What else could explain this association?
● More Statistics in the News
○ Headline: Want to live longer? Get a dog
(http://www.cnn.com/2017/11/17/health/dog-owners-heart-disease-and-
death/index.html)
■ The article mentions the following:
○ Dog ownership is associated with a reduced risk for cardiovascular disease and
death
○ The study looked at over 3.4 million Swedish individuals between the ages of 40
and 80 sampled from a national database and the Swedish Twin Register over a
12-year study period.
○ The study provides evidence of the health benefit of dogs but does not answer
why dogs have these health benefits. Not controlled for were things like owner’s
general health and personality.
● What do you think?
○ Suppose you are asked to measure “success in college.” How can this be
measured?
○ Many researchers have attempted to study variables that relate to success in
college:
■ GPA versus exam scores: What’s better in predicting college success?
(https://thejournal.com/articles/2017/03/09/gpa-versus-exam-
scores.aspx)
■ Study finds small words can predict future collegiate success
(http://college.usatoday.com/2015/01/23/study-finds-small-words-can-
predict-future-collegiate-success/)
■ Why hopefulness is a greater predictor of academic success than
intelligence (http://bigthink.com/hope-optimism/why-being-hopeful-
rather-than-optimistic-will-make-you-a-better-student)
■ Study Links Facebook to Lower GPA
(http://www.internetnews.com/webcontent/article.php/3815241/Study
+Links+Facebook+to+Lower+GPA.htm)
● More Statistics in the News
○ Headline: “Eyelashes grow to just the right length to shield eyes”
(https://www.npr.org/sections/health-shots/2015/02/25/389005192/eyelashes-
grow-to-just-the-right-length-to-shield-eyes)
■ A study of 22 different mammals revealed that the ideal eyelash length is
about one-third the width of the eye.
■ Implications: Wearing false eyelashes might do more harm than good by
channeling dust into your eyes.
● Scatterplot Pt. 1
Document Summary
Chapters 14 and 15: describing relationships (scatterplots, correlation, regression, and prediction) Kids who eat candy every day grow up to be violent criminals http://www. dailyfinance. com/story/happy-halloween-kids- who-eat-candy-every-day-grow-up-to-be-viol/19181696/ A large study of nearly 17,500 participants in britain found that 69 percent of the participants who had committed violence by age 34 had eaten sweets or chocolate nearly every day during childhood. Dog ownership is associated with a reduced risk for cardiovascular disease and death. The study looked at over 3. 4 million swedish individuals between the ages of 40 and 80 sampled from a national database and the swedish twin register over a. The study provides evidence of the health benefit of dogs but does not answer why dogs have these health benefits. Not controlled for were things like owner"s general health and personality. Many researchers have attempted to study variables that relate to success in college: Gpa versus exam scores: what"s better in predicting college success? (https://thejournal. com/articles/2017/03/09/gpa-versus-exam- scores. aspx)
