Population. Other figures shown for 1940 and 1930 are based on independent estimates. are Reliability of the estimates.--Since the estimates, estimates except the independent and complete census data mentioned above, based on sample data, they are subject to sampling variability. Table D presents the approximate standard error of sample estimates of selected size for over-all totals, i.e., those not classified by the items noted below, for 1953. The standard error is a measure of sampling variability. Sample estimates may differ, due to sampling variability, from the figures which would result from a complete enumeration. The chances are about 2 out of 3 that this difference is less than the standard error. The amount by which the standard error must be multiplied to obtain other odds deemed more appropriate can be found in most statistical textbooks. For example, the chances are about 19 out of 20 that the difference is less than twice the standard error and 99 out of 100 that it is less than 2 times the standard error. A.--Households, families, subfamilies, and unrelated individuals, for the United States: 1930 to 1953...... .... 1 B.--Percent of civilian population in families and in other types of units, for the United States, urban and rural: April 1953..... 2 C.--Percent distribution of families, by age of head and age of children, for the United States: April 1953..... D.--Standard error of estimated number... E. --Standard error of estimated percentage... 277 DETAILED TABLES Table 1.--Households, families, subfamilies, and quasi households, and population in these units by age, for the United States (with urban and rural residence for 1953): Civilian population, April 1953 and March 1950, and total population, April 1940... 2.--Households, families, subfamilies, married couples, parent-child groups, and unrelated individuals, by type, for the United States, urban and rural: April 1953.. 3.--Characteristics of households, by type, for the United States, total and nonfarm: April 1953..... 4.--Characteristics of families by type, for the United States, total and nonfarm: April 1953..... 5.--Families by type, age of head, and number of own children under 18 years old, for the United States: April 1953...... 6.--Families by type, age of head, and presence of own children under 3, 3 to 5, and Page 9 10 11 12 13 6 13 for the United 14 14 9.--Married couples by age and labor force status of husband and wife, for the United States: April 1953...... 15 8.--Families and subfamilies by number and age of own children, for the United States: April 1953.... 10.--Labor force status of married women, husband present, by presence of own children under 6 years old and from 6 to 17 years old, for the United States, urban and rural: April 1953..... 11.--Characteristics of unrelated individuals by type, for the United States, total and nonfarm: April 1953.... 15 16 Table 1.--HOUSEHOLDS, FAMILIES, SUBFAMILIES, AND QUASI HOUSEHOLDS, AND POPULATION IN THESE UNITS BY AGE, FOR THE UNITED STATES (WITH URBAN AND RURAL RESIDENCE FOR 1953): CIVILIAN POPULATION, APRIL 1953 AND MARCH 1950, AND TOTAL POPULATION, APRIL 1940 |