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.
Private investment, from a macroeconomic standpoint, is the purchase of a capital asset that is expected to produce income, appreciate in value, or both generate income and appreciate in value. A capital asset is simply property that is not easily sold and is generally purchased to help an investor to generate a profit.