Overview
This lecture explains how to determine the sample size from a histogram summarizing the amount of sugar in organic snacks.
Interpreting the Histogram
- The horizontal axis represents intervals of sugar amounts (in milligrams) for each snack.
- The vertical axis shows the frequency, or the number of snacks, in each sugar interval.
- The height of each histogram bar corresponds to the frequency for that interval.
Calculating Sample Size
- Frequency for the first interval: 4 snacks.
- Frequency for the second interval: 4 snacks.
- Frequency for the third interval: 9 snacks.
- Frequency for the fourth interval: 14 snacks.
- Frequency for the fifth interval: 10 snacks.
- Frequency for the sixth interval: 3 snacks.
- Frequency for the seventh interval: 3 snacks.
- Total sample size (n) = 4 + 4 + 9 + 14 + 10 + 3 + 3 = 47 snacks.
Key Terms & Definitions
- Histogram — a bar graph representing the frequency of data within specified intervals.
- Frequency — the number of observations within a particular interval.
- Sample Size (n) — the total number of observations in the data set.
Action Items / Next Steps
- Practice calculating sample size using histograms with different data sets.