Lab 2-Scientific Measurements

Question 1

Qualitative

Answer 1

Describe a characteristic or a category of an object. Often do not require tools. Ex. Presence/absence, gender, texture, taste

Question 2

Accuracy

Answer 2

Reflects how close a measurement or calculation is to the true value being measured

Question 3

Precision

Answer 3

Reflects how reproducible or repeatable the measurement is.

Question 4

Standard deviation applies only to:

Answer 4

Precision

Question 5

Dynamic Range

Answer 5

The ratio between the smallest and largest possible values it can measure.

Question 6

The greater the dynamic range of an instrument, the __________ its precision.

Answer 6

Higher

Question 7

Replication of a measurement can be done by:

Answer 7

• measuring a single object multiple times

* measuring multiple similar objects a single time each

Question 8

Mean reflects:

Answer 8

“best guess” at the true measurement

Question 9

Standard deviation is a measure of:

Answer 9

Precision

Question 10

Quantitative

Answer 10

Require some type of equipment: a ruler, digital scale, stopwatch. Must be expressed in the form of some unit: inch, mm, year, minute.

Question 11

% error =

Answer 11

[(observed-expected) / (expected)] x 100