mbf 3ci - u3 - d2 - collect and analyse data - complete ...teachers.wrdsb.ca › ... ›...
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MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
Warm Up:Identify the sampling method used in each situation:
a) All grade 9 students at W-O were asked to complete a survey identifying their favourite extra-curricular activity offered at W-O
b) Homeroom teachers were asked to randomly select 5 students from their class to complete a survey asking whether they were in favour of changing to semesters
c) Parents of WRDSB students were asked to complete an online survey about changing school start times.
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
Unit 3 - One Variable StatisticsDay 2 - Bias
Today we will...1. Determine the meaning of bias and how it relates to
collecting data2. Learn how to recognize different kinds of bias and how to
improve/eliminate these biases3. Learn the difference between primary and secondary
sources4. Learn the difference between population and samples
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
What is Bias?
What types of Bias are there?
Bias is something that causes misinterpretation or misrepresentation of information.
• Response Bias• leads the person responding to choose the response you expect• Non-response Bias• does not reflect the population • Measurement Bias• limits the choices• highlights something incorrectly
• how the question was posed• who was asked• who responded• how the information is displayed
Bias can result from:
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
What is the difference between data from a primary source and data from a secondary source?
Primary data - data that you collect yourself
Pro: you know the reliability of the dataCon: time consuming
Secondary data -
Pro: easily accessible (web)Con: you may not know the reliability of the source.
data that you obtain from someone else
Primary data - data that you collect yourself
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
Who is asking the question?Who is responding to the question?Who is the question about?
Which of the above questions will help you identify:
a) the sample?
b) the population?
Questions you should ask yourself when reading about statistics.
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
A. The following questions were asked, which one could produce bias? Explain.
1. What is your favourite subject?
2. Select your favourite subject: Math Tech StudiesScience HistoryLanguages Other_________
HAND OUT
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
B. What is wrong with the following question? Why will it create bias?
Select your favourite soda:Coke 7-upPepsi Root BeerOrange Dr. PepperSprite Fresca
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
To determine the favourite brand of fabric softener a survey was placed in grocery bags at Zehrs. The customers were asked to mail their responses back to the consumer group collecting the data.
C. Why are the results biased?
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
D. Which graph is biased? Why?
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
E. Discuss the bias that will result from each situation. Suggest ways to remove the bias.a) Residents of a community are asked this survey question:Building a garbage incineration power plant in the neighbourhood will increase jobs and encourage government funding of other programs beneficial to our community. Would you be in favour of this much needed venture?
b) A group of professional football players are asked if they have ever taken banned performance enhancing substances.
c) The members of an elite golf club are asked if they will approve the construction of a subsidized housing complex on the land adjacent to their golf course.
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
Today's Practice Questions
p. 114 #1 - 5, 7, 12, 13
MBF 3CI U3 D2 Collect and Analyse Data Complete.notebook
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November 07, 2014
Canadian Broadcasters Say C32 Needed to Save Local Radio
Wednesday March 02, 2011
Last year, Canadian broadcasters launched a major public campaign to "Save Local TV", which was their effort to rally support for new fees for retransmission of local television signals. The Federal Court of Appeal ruled this week that the CRTC has the legal power to authorize networks to negotiate to be paid for carrying stations, though the recent convergence in the marketplace may render the entire issue moot.
Interestingly, Canadian radio broadcasters are now using the same strategy as part of their support for Bill C32. A new campaign isupportmylocalradio.ca has been launched complete with radio ads and a webpage. The goal of the campaign is to express support for Bill C32, particularly the reforms that will save radio broadcasters tens of millions of dollars. The claims mirror those in the feeforcarriage campaign "Local radio in Canada may be threatened if Bill C32 is not passed as introduced by the Government. This much needed Bill may fail because the Liberal Party wants an amendment that would have local radio stations send money to big recording companies outside Canada." The broadcasters appear before the C32 committee on Thursday.
<http://www.theglobeandmail.com/reportonbusiness/tvstationsmaychargecablecostocarrythem/article1924284/>
<http://www.cabacr.ca/english/copyright/default.shtm>
<http://www.facebook.com/permalink.php?story_fbid=113066888771847&id=163616660355476>
Other:<http://copyright.michaelgeist.ca/copyrighttakeaction>
http://www.therecord.com/news/local/article/496761localhighschoolstudentsmoreconservativenewsurveysuggests
Ontario Schools Survey