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Today’s Safety Zen. Is it safer to use vacuum systems than pressured systems?. vs. Graph Interpretation Problems. Graph vs. picture Slope vs. height Disconnect from data tables. Worst Graphing Ever?. Distinguish misconceptions from errors. Which is bigger?. 1/3 vs. 1/8 2.36 vs. 4.2

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Is it safer to use vacuum systems than pressured systems

Today’s Safety Zen

Is it safer to use vacuum systems than pressured systems?

vs.


Graph interpretation problems
Graph Interpretation Problems

  • Graph vs. picture

  • Slope vs. height

  • Disconnect from data tables




Which is bigger
Which is bigger?

  • 1/3 vs. 1/8

  • 2.36 vs. 4.2

  • g vs. mg


Examples of math misconceptions
Examples of Math Misconceptions

  • Multiplication always creates bigger numbers.

  • Multiplication by 10 adds a zero.


Powers of ten gahh
Powers of Ten –Gahh!

Metrics

Dilutions

Environmental Science



Statistics correlation vs causation
Statistics:Correlation vs. Causation

  • Belief: Fluoridated water causes cancer.

  • Belief: Vaccines cause autism.


The birthday problem

If you have 23 people in a room, what is the probability that two of them will have the same birthday?

The Birthday Problem


And then there s the hadron collider
And then there’s the that two of them will have the same birthday?Hadron Collider…


Misunderstanding probability
Misunderstanding Probability that two of them will have the same birthday?

  • Genetics

  • Health


Which sounds worse
Which sounds worse? that two of them will have the same birthday?

  • A woman born today has a 1 in 8 chance of developing breast cancer.

  • 88% of the women born today will never develop breast cancer.


Mammography statistics
Mammography Statistics that two of them will have the same birthday?

  • The probability that a woman has breast cancer is 1%.

  • If a woman has breast cancer, the probability that she tests positive is 90%.

  • If a woman does not have breast cancer, the probability that she nevertheless tests positive is 9%.

A woman has a positive mammogram. What is her

risk of actually having breast cancer?

A. Out of 10 women with a positive mammogram, ~9 have breast cancer.

B. Out of 10 women with a positive mammogram, ~1 has breast cancer.

C. The probability that she has breast cancer is about 1%.


Guidelines for preventing math errors
Guidelines for Preventing Math Errors that two of them will have the same birthday?

  • Keep track of all information (paper trail).

  • Use visual keys, such as arrows.

  • Keep track of units.

  • State answer clearly, WITH UNITS.

  • Check that your answer makes sense.


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