The plus-or-minus quantity .12 is called the margin of error of the sample mean associated with a 95% confidence level. It is also correct to say ``we are 95% confident that is within .12 of the sample mean 3.05''. However, .12 is a large number.
DEFINITION of 'Investing'. The act of committing money or capital to an endeavor (a business, project, real estate, etc.) with the expectation of obtaining an additional income or profit. Investing also can include the amount of time you put into the study of a prospective company, especially since time is money.
Understand the kind of product you are buying. An investment, such as a mutual fund, exchange-traded fund or annuity, is a product that has been developed and packaged by a company. That doesnât necessarily mean itâs wrong for you, but it does mean you should do some detective work to sniff out the fee structures.