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.
Capital is money that is used to generate income or make an investment. For example, the money you use to buy shares of a mutual fund is capital that you're investing in the fund.apital is an extremely vague term, and its specific definition depends on the context in which it is used. In general, it refers to financial resources available for use: working capital.