Error bars illustrate the margin of error for a survey estimate by showing how precise that estimate is. Here are some answers to common questions that might help you better understand charts with ...

Increase the final digit of a decimal number by 1. Increase the last non-zero digit of a whole number by 1. Lower limit: Use the number itself. The error interval is ...

Last month in Points of Significance, we showed how samples are used to estimate population statistics. We emphasized that, because of chance, our estimates had an uncertainty. This month we focus on ...