Algebra Stations

WELCOME TO ADVANCED MATH CLASSMs. StadekerAdvanced Math 2013-2014

FENGERTITANSAdvanced MathMonday, September 9, 2013Objective (students will be able to): Understand the role of bias in everyday events. Accurately describe possible biases that may arise when doing a research project of their choosing.Agenda:Daniels/Stadeker - 2013-142Advanced Math

Exit Slip Do NowCheck-InWhat is bias?DebriefHomeworkFENGERTITANSDo NowRespond to this prompt: Is the Fenger High School dress code fair?

Ready, set, go!Daniels/Stadeker - 2013-143Advanced Math

FENGERTITANSWhat is Bias?Systematic Error due to a non-random sample of a population

Refers to tendency of a sample statistic to systematically over- or under- estimate a population.

Feelings and opinions not facts

Often occurs when the survey sample does not accurately represent the population. FENGERTITANSWhere can bias occur?Bias is most likely to occur within a study when the population is underrepresented. (Selection Bias)

Undercoverage - occurs when some members of the population arent represented in the sample

Nonresponse bias - individuals chosen for the sample are unwilling or unable to participate in the survey

Voluntary response bias - The resulting sample tends to overrepresent individuals who have strong opinions.

FENGERTITANSA classic example of undercoverage is the Literary Digest voter survey, which predicted that Alfred Landon would beat Franklin Roosevelt in the 1936 presidential election. The survey sample suffered from undercoverage of low-income voters, who tended to be Democrats.How did this happen? The survey relied on a convenience sample, drawn from telephone directories and car registration lists. In 1936, people who owned cars and telephones tended to be more affluent. Undercoverage is often a problem with convenience samples.5Bias in Surveys3 Types of Survey Bias

Response bias - Refers to the bias that results from problems in the measurement process.

Leading questions - Questions tend to lead the individual to a certain response.

Social desirability - Most people like to present themselves in a favorable light, so they will be reluctant to admit to illegal activities in a survey, particularly if survey results are not confidential. Instead, their responses may be biased toward what they believe is socially cool.FENGERTITANSHow do we eliminate bias?Instructions:You will be put into pairsUsing the the different types of bias, students will write 3-5 ways to eliminate bias when asking questionsStudents will write their responses and group members on a notecardStudents should decide who will be the note taker and who will the point personYOU HAVE 15 MINUTESDaniels/Stadeker - 2013-14Advanced Math7

FENGERTITANSDebriefInstructions:Students will give their presentation at the front of the class and ask/answer questionsBoth team members must speak in this activityClass should determine why/why not each groups responses would be effectiveStudents should decide who will be the note taker and who will the point personYOU HAVE 1 MINUTEDaniels/Stadeker - 2013-14Advanced Math8

FENGERTITANSHOMEWORKIdentify two examples of each type of survey bias discussed in class:Response BiasLeading QuestionsSocial Desirability

Daniels/Stadeker - 2013-149

Advanced MathFENGERTITANSHAVE A GREAT DAY!!!Mr. DanielsDaniels/Stadeker - 2013-1410Advanced Math

FENGERTITANS