1 Recycling one ton of newspaper saves 15 trees. 2  Every ton of newspaper recycled saves 4100 kWh or enough energy to power a TV for 31 hours. 3  Recycling a soda can saves 96 percent of the energy used to make a can from ore and produces 95 percent less air pollution and 97 percent less water pollution. Recycling one ton of cardboard saves over nine cubic yards of landfill space. 2  Number of landfills in operation in 1978: 14,000; in 1988: 7,924; in 2001: 1,858; in 2006: 1,754. 3  Recycling one ton of newspaper saves 15 trees. 4  Every ton of newspaper recycled saves 4100 kWh or enough energy to power a TV for 31 hours.
Once the standard error is calculated, the confidence interval is determined by multiplying the standard error by a constant that reflects the level of significance desired, based on the normal distribution. The constant for 95 percent confidence intervals is 1.96.
Standard error: The standard error equals. Interpretation of confidence intervals. The interval estimate for is expressed as: Assuming that we are using a value of =.05, we can say that, in repeated sampling, 95% of the intervals constructed this way will include.