Significance

7 important questions on Significance

When is a number significant?

- All non-zero digits
- Zero's between non-zero digits
- NOT: leading zero's
- Trailing zero's in decimal numbers (to the right of the first non-zero digit in a decimal number)
- COULD BE: trailing zero's in a non-decimal number

How many significant numbers after addition/ substraction?

As many as the numbers behind the decimal point.

How many significant numbers after multiplication/ devision?

Least amount of significant figures.
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What is the difference between an error and a mistake?

Error = inevitable (measuring uncertainty)
Mistake = improper use of the measuring device

How can you present measurement uncertainties?

As an absolute, a relative and an error in terms of percentage.

What kind of errors exist?

Method error, instrument error, reading error, zero point error

How big are the chances that a measurement falls in 1sd, 2sd, 3sd?

1 sd: 68 %
2 sd: 95 %
3 sd: 99,7 %

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