Learn how to collect representative data through random sampling and use statistical inference to draw conclusions about populations from samples!
Identify the sampling method!
Scenario:
Calculate the confidence interval!
Given:
It's often impossible or impractical to study an entire population. Instead, we study a sample and use statistical inference to draw conclusions about the population.
Key Terms:
Population: All students in a school (1000 students)
Sample: 100 randomly selected students
Population parameter: Average height of all students (unknown)
Sample statistic: Average height of 100 students (known, used to estimate parameter)
From a sample of 100 students with average height 5'6", we infer that the population average is likely around 5'6" (with some margin of error).