Textbook Notes (363,185)
Canada (158,247)
Statistics (98)
STAT 101 (27)
Chapter 2

Chapter 2.docx

1 Page
Unlock Document

Simon Fraser University
STAT 101
Rick Routledge

CHAPTER 2 Measuring the Mean (Average) ̅  Add their values and divide by the number of observations Measuring the Median (Center)  Arrange all observations in order of size from smallest to largest Mean vs. Median  The mean and median of a roughly symmetric distribution are close together  If the distribution is exactly symmetric, the mean and median are exactly the same  In a skewed distribution, the mean is usually father out in the long tail than the median Measuring the Quartiles  Order the observations in increasing order and locate the median  First quartile – the middle of the left side of the median  Lower quartile – the middle of the right side of the median Five number summary  A distribution consisting of the: - Smallest observation - First quartile - Median - Third quartile - Largest observation Boxplot  Central box span of the first and third quartile  Line in the box marks the median  Lines extend from the box out to the smallest and largest observation - Boxplots show less detail than histograms and stemplots, best used for side-by-side comparison of multiple distributions Spotting Suspected Outliers  Interquartile range (IQR) – the distance between the first and third quartile  IQR = -  1.5 x IQR  Finding potential outliers Example: IQR = 27.5 1.5 x IQR = 1.5 x 27.5 = 41.25 Any values that does not fall between – (1.5 x IQR) = 15.0 – 41.25 = -26.25 – (1.5 x IQR) = 42.5 + 41.25 = 83.75 are suspected outliers Measurin
More Less

Related notes for STAT 101

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.