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Welcome! Today we will explore the Preamble and learn how to analyze survey data about our government.
The Preamble is the opening of the U.S. Constitution. It explains the goals of our government, such as forming a better union and keeping peace.
We apply spelling rules to write key social studies words. For example, we add the suffix '-ice' to the root word 'just' to spell 'justice'.
We use a random sample to make inferences about a population. A sample of 100 random citizens can predict how a whole city of 50,000 feels about a law.
We can also compare two populations using random samples. If 70% in Town A support a constitutional rule but only 30% in Town B do, Town A supports it more.
A researcher takes a random sample of 50 people from District 1 and 50 people from District 2. She asks if they know the purpose of the Preamble. In District 1, 40 people say yes. In District 2, 20 people say yes. What can we infer?
- 1. Calculate the percentage for District 1: 40 out of 50 equals 80%.
- 2. Calculate the percentage for District 2: 20 out of 50 equals 40%.
- 3. Compare the two sample results: 80% is greater than 40%.
- 4. Make an inference: District 1 citizens generally understand the purpose of the Preamble better than District 2 citizens.
