Get expert advice and insights on any topic with IDNLearn.com. Discover in-depth and reliable answers to all your questions from our knowledgeable community members who are always ready to assist.

For a research project, you need to be 99% confident that the estimate of the population mean is off by less than 45. If the standard deviation of the population is 121, how large must your sample be?
- 28
- 48
- 5