Key Concepts
- Random Sampling: A method of selecting a subset of individuals from a population to make generalizations about the whole group.
- Sample Proportions: The fraction of a sample exhibiting a certain characteristic, which can be used to estimate the proportion in the entire population.
- Estimating Population Values: Using sample proportions to infer the likely number of individuals in the whole population that exhibit a characteristic.
Skills Covered
- Extracting sample statistics from problem statements.
- Using sample proportions to estimate population proportions.
- Setting up and solving proportion equations.
Example Problems
- A company surveyed 50 employees, and 10 of them attended a training. Estimate how many of the 500 employees in the company likely attended the training.
- A poll of 200 voters found that 60% supported a candidate. Predict how many of 10,000 voters would support the candidate.