# chapter 1 and 2 vocabulary words

## 27 terms

### inferring

reasoning based on what you already know.

### Predicting

a statement about what will happen in the future based on past experience.

### Classifying

grouping together of items that are alike in some way.

### Evaluating

involves comparing observations and data to reach a conclusion

### Scientific investigation

The way scientists study our natural world.

### metric system

measurment based on the number 10.

1000

100

10

.1

.01

.001

### mass

the measure of the amount of matter in an object.

### weight

measure of the force of gravity acting on an object.

### volume

the amount of space an object takes up.

### Density

measure of how much mass is contained in a given volume

### estimate

an approximation of a numberbased on reasonable assumptions.

### accuracy

refers to how close a measurment is to the true value.

### precision

how close a group of measurements are to each other.

### mean

average of a set of data

### median

middle number in a set of data

### mode

most frequently occuring number

### range

the difference between the greatest and least value in a set.

### linear graph

forms a line on a line graph

### nonlinear

does not form a line on a graph. such as a curve.

### hypothesis

a educated guess. a possible answer to a scientific question.

### variable

the 1 thing in a experiment that you choose to change to see a reaction.