notes bias and error in science bias: this means you are prejudiced towards or against something and...
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Notes Bias in Science Experiments Example: Imagine that you doing an experiment to determine which NFL football quarterback can throw a football the furthest. Your favorite football team is the Tennessee Titans, so you are disappointed with your data when you notice that the Titans' Mariota’s throwing distance is not the furthest. Yet because he is your favorite quarterback, you change the data so that this Mariota appears to throw the furthest. Science SPI 0807.Inq.5: Bias and Error This is BIAS, and it should NEVER be allowed in science.TRANSCRIPT
Notes
Bias and Error in ScienceBias: this means you are prejudiced towards or against something and that you allow your views to affect the results of your experiment.
Bias Is Bad!Bias
Science is about obtaining accurate resultsso bias should NEVER be allowed to influenceyour experimental results!
Bias
ScienceSPI 0807.Inq.5: Bias and Error
Agenda1) Paper, Rock, Scissors.2) Notes.3) Exit Ticket.
1. Yellow will say Paper, Rock, Scissors Shoot2. Blue and Red will go first best two out of three wins.
3. The winner will play Yellow.
Notes
Rock, Paper, Scissors
ScienceSPI 0807.Inq.5: Bias and Error
BIAS should NEVER be allowed in science experiments!
Notes
Bias in Science ExperimentsExample: Imagine that you doing an experiment to determine which NFL football quarterback can throw a football the furthest.Your favorite football team is the Tennessee Titans, so you are disappointed with your data when you notice that the Titans' Mariota’s throwing distance is not the furthest. Yet because he is your favorite quarterback, you change the data so that this Mariota appears to throw the furthest.
ScienceSPI 0807.Inq.5: Bias and Error
This is BIAS, and it should NEVER be allowed in science.
Example: Naomi loves to eat carrots. Mr. Holifield conducts an
experiment to determine how much better carrots are for babies as opposed to all other baby food.
Identify the bias or error in this situationANSWER: Because Naomi likes carrots, Mr. Holifield
wrongly assumes that ever other baby will like carrots too.
He is biased toward carrots, so his results will contain errors.
Notes ScienceSPI 0807.Inq.5: Bias and Error
BIAS should NEVER be allowed in science experiments!
Two students who love Drakes new song “back to back” do an experiment to measure how long people have to hear one ofDrakes songs before they too fall in love with his music. Question: How could the students adjust the experiment to
remove the Bias and error ?
Notes
Bias in Science
ScienceSPI 0807.Inq.5: Bias and Error
BIAS should NEVER be allowed in science experiments!
Humans are imperfect, so bias happens both intentionally and unintentionally
Notes
Solutions to Bias in Science
ScienceSPI 0807.Inq.5: Bias and Error
Ways to Reduce and/or Eliminate Bias Be aware that bias can and does happen Strive to recognize it, and eliminate it from your
experiments. Follow the steps and principles of the scientific method Make sure that others rigorously review your work
looking for bias
Notes SPI 0807.Inq.5: Bias and Error
Famous Bias in Science
Science
Thomas Edison and Direct Current Electricity
Inventor: Thomas Edison
Notes SPI 0807.Inq.5: Bias and Error
Famous Bias in Science
Science
Direct Current vs Alternating Current
Bias:
Edison promoted direct current electricity, but Nikola Tesla promoted alternating current for the Westinghouse Electric Company.
Experiments had clearly demonstrated that alternating current was more efficient and less expensive. Yet Edison refused to yield to facts.
Nearly all electricity generated today is alternating current
Avoid Mistakes: One small error can result in all your experimental data
being wrong So scientists work very hard to avoid making mistakes
Peer Review: One key way scientists deal with this issue is by having
other scientists review their work to check for mistakes This very common practice is called peer review
Notes SPI 0807.Inq.5: Bias and Error
Errors in Science
Science
O’DEER: Think back to our activity1. What was the Independent Variable?2. What was the dependent Variable?3. Was there any error? If So what caused it? 4. The next time this activity is completed what can be
done to eliminate the bias and error?
Notes SPI 0807.Inq.5: Bias and Error
Errors in Science
Science
Notes SPI 0807.Inq.5: Bias and Error
Famous Errors in Science
Science
Mars Climate Orbiter:
Notes SPI 0807.Inq.5: Bias and Error
Famous Errors in Science
Science
Mars Climate Orbiter:
Expensive Mistake:
launched by NASA in December 1998, this robotic spacecraft was designed to study weather on Mars.
A design team used standard units (pounds- seconds) while a different design team used metric units (newtons- seconds). So instead of orbiting Mars, the spacecraft crashed to the surface of the red planet.WHAT UNIT DO WE ALWAYS USE IN SCIENCE!?!?
Cost of this mistake: $327 million dollars
Notes SPI 0807.Inq.5: Bias and Error
Famous Bias and Errors in Science Science
Canals on Mars
Astronomer: Percival Lowell
Notes SPI 0807.Inq.5: Bias and Error ScienceFamous Bias and Errors in Science
From 1894 to 1908 Percival studied the planet Mars with a large telescope.
He wrongly concluded that the features on Mars were canals built by extraterrestrials (Martians)
Notes SPI 0807.Inq.5: Bias and Error Science
Percival was fascinated about the possibility of intelligent life on Mars .
He was biased about this.
He observed hazy images of the surface of MarsHis bias lead him to make significant errors about what he saw.
Later observations by others confirmed that there are no signs of intelligent life on Mars.
Famous Bias and Errors in Science
Notes SPI 0807.Inq.5: Bias and Error
Famous Bias and Errors in Science Science
Canals on Mars
Astronomer: Percival Lowell
Assessment SPI 0807.Inq.5: Bias and Error
Exit TicketScience
Assessment SPI 0807.Inq.5: Bias and Error
Exit TicketScience
Assessment SPI 0807.Inq.5: Bias and Error
Exit TicketScience
Assessment SPI 0807.Inq.5: Bias and Error
Exit TicketScience