Class Notes (809,629)
Canada (493,757)
Statistics (237)
STAT151 (146)

STAT 151 (09/16/13) Ch 5&6

4 Pages
Unlock Document

University of Alberta
Paul Cartledge

STAT 151 (September 16, 2013) Chapter 5 & 6 (w/ Sampling Type Overview) Sampling: Sampling frame – list created of subjects from a population chosen to be a part of the sample Random sample – sampling where each element of a population has a chance to be selected to be a part of the sample Other sampling methods: Stratified random sample: divided population into strata (SRS from each stratum) Elements (random sampling conducted on each strata) Cluster random sample: population divided into clusters and then random whole clusters are chosen Reduces cost by increase sampling efficiency Systematic sample: individuals are chosen from a sampling frame using a system Convenience sample: only individuals of a population who are conveniently available are chosen Voluntary response: individuals who volunteer their answer/responses to be collected (biased) Boxplots: - shows center spread, and skewness of a data (shows 2 layers of skewedness) EX Dataset: 7.9, 9.1, 9.2, 9.3, 9.4, 9.4, 9.5, 9.6, 9.6, 9.7 1. Rank the data smallest to largest. 2. Find median, Q1, Q3, and IQR a. According to ex: i. Q1: 9.2 ii. Q2: 9.6 iii. Median = 9.4 iv. IQR = 0.4 b. Find points beyond boundaries: 1.5*IQR below Q1 and 1.5*IQR above Q3 i. Aka lower and upper inner fence ii. These points are outliers (because it is outside the interquartile range) iii. If IQR = 0.4 1. Lower I.F. = 9.2-0.6 = 8.6 2. Upper I.F. = 9.6+0.6 = 10.2 iv. Marked with perpendicular dotted line 3. Find the smallest & largest values within the respective inner fences a. With the example = 9.1-9.7 4. Draw a linear scale containing ALL the data (even the ones not included within
More Less

Related notes for STAT151

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.