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# Scientific Investigations and Measurement Tools

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Author: Lori Green
##### Description:

A full review of the Scientific Investigation and Measurement Tools unit for 7th grade science.

In this tutorial, you will review the following:

- common measurement tools in science lab
- common units of measurement
- difference between observation and inference
- difference between qualitative and quantitative
- types of variables
- how to build a hypothesis
- how to graph data (DRY MIX)
- types of investigations

(more)

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Tutorial

## Measurement Tools in Science

What are common measuring tools in the science lab?

## Observation vs. Inference and Types of Data

What's the difference between making an observation and making an inference? What are the two types of data you can collect? Watch this video to find out more.

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## Using a hypothesis to find variables

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## How do I design a hypothesis?

Sometimes scientists use a hypothesis to help guide an experimental investigation. A hypothesis is a logical explanation about the relationship between two factors: the independent and dependent variables. A hypothesis is testable; an experimental investigation can be done based on the hypothesis.

An “If..., then...” statement shows cause and effect. In other words, what effect does the independent variable have on the dependent variable? Or what does the independent variable cause the dependent variable to do?

The independent variable is the “cause” and the dependent variable is the “effect."

If ___(independent variable)____, then ___(dependent variable)__ will ___(how the dependent variable will change)___.

Take these hypothesis for example:

1) If I eat five large pizzas once a week for a month, then my weight will increase by 10 lbs.
- the IV: the pizza I am eating
- the DV: my weight
- how it will change: my weight will increase by 10 lbs.

And now, from my hypothesis, I know how to set up and conduct my investigation. I will revisit my hypothesis at the end of the testing period (1 month-- which is in my hypothesis) and see how my results supported or did not support my hypothesis.

## Types of Investigations

Visit this Smore to find out all about the three types of investigations: https://www.smore.com/qzxds-types-of-investigations