An In-Class Demonstration to Help Students Understand Confidence Intervals

Figures & data

Table 1. Confidence Interval Estimation Facts (Based on 1996 Data)

Category	Fact	Units	True value
United States	Geographic area	Square miles	3,787,428
	# students (school & college)	People (in millions)	59.9 million
	% of population in cities	Percentage	77.5
	Population growth from 1986 to 1996	People	22,164,068
	Average population density	People per square mile	70.3
	Per capita GNP	US$ per person	22,568
	Total labor force	People (in millions)	118.9 million
World	Total land area	Square miles	57.49 million
	Height of Mount Everest	Feet	29,030
	Per capita GNP	US$ per person	5,900
	Average population density	People per square mile	100.4

Figure 1. Student Intervals for Phase

Figure 2. Computer-Generated 95% Confidence Intervals for the Mean of a Normal Distribution, n = 10.

Figure 3. Computer-Generated 95% Confidence Intervals for the Mean of a Normal Distribution, n = 20.

Figure 4. Computer-Generated 90% Confidence Intervals for the Mean of a Normal Distribution, n = 10.