p Chart for Marriage Rates Use p charts to compare the statistical stability of the marriage rates of Japan and the United States. In each year, 10,000 people in each country were randomly selected, and the numbers of marriages are given for eight consecutive and recent years (based on United Nations data).

Japan: 58 60 61 64 63 63 64 63 United States: 98 94 92 90 91 89 88 87 13-3 Beyond the Basics