Is it safer to use vacuum systems than pressured systems?

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Is it safer to use vacuum systems than pressured systems?

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Is it safer to use vacuum systems than pressured systems?

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Today’s Safety Zen

vs.

- Graph vs. picture
- Slope vs. height
- Disconnect from data tables

- 1/3 vs. 1/8
- 2.36 vs. 4.2
- g vs. mg

- Multiplication always creates bigger numbers.
- Multiplication by 10 adds a zero.

Metrics

Dilutions

Environmental Science

- Belief: Fluoridated water causes cancer.
- Belief: Vaccines cause autism.

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

- Genetics
- Health

- 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.

- 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%.

- 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.