É correta a afirmativa:

Item 1 Se Y é uma variável aleatória Normal com média 0 e variância 1; se X segue uma Qui- quadrado com r graus de liberdade; e se Y são X independentes, então !$ Z = Y / \sqrt { ^{X}/_{r}} !$segue uma distribuição t com r graus de liberdade.

Sobre as privatizações ocorridas na economia brasileira, é correto afirmar que:

Item 1 no Governo Collor, as principais empresas privatizadas foram as produtoras de bens siderúrgicos, petroquímicos e fertilizantes;

The concept of fundamental or “intrinsic” value was also understood by players in the early stock market, although misleading prospectuses, the manipulation of share prices, and the stock market boom made its discovery an even more difficult task than usual. After the 1690s boom, Daniel Defoe (of Robinson Crusoé fame) stated that many stocks had been raised above their “intrinsic value” and that shares in the East India Company had sold at between 300 and 400 percent above their nominal value “without any material difference in intrinsic value”. The contemporary land-bank projectors, who wanted to replace a gold-backed currency with one supported by the value of land, even realized that the notion of “intrinsic value” was an oxymoron*, since “intrinsic” suggested and inward quality, while “value” was always external. For instance, Nicholas Barbon argued that “things have no value in themselves, it is opinion and fashion which brings them into use and gives them a value”. John Law, who was also a land-bank projector, went even further and claimed that price was simply the result of the interaction of supply and demand. Applied to the stock market, Law’s idea suggests that share prices are determined by liquidity (the supply of new funds to the market) rather than a reflection of inherent values.

* Note: Oxymoron (oximoro em português) “is a figure of speech in which opposite or contradictory ideas are combined (e.g. thunderous silence, sweet sorrow)”. Webster’s New Dictionary.

According to the text

Item 2 present-day land-bank projectors want to replace gold-backed currency with a land-backed currency.

TEXT 1

Rescuing environmentalism
(From The Economist print edition, Apr 21st 2005)

Market forces could prove the environment's best friend—if only greens could learn to love them

"The environmental movement's foundational concepts, its method for framing legislative proposals, and its very institutions are outmoded. Today environmentalism is just another special interest." Those damning words come not from any industry lobby or right-wing think-tank. They are drawn from "The Death of Environmentalism", an influential essay published recently by two greens with impeccable credentials. They claim that environmental groups are politically adrift and dreadfully out of touch. They are right. In America, greens have suffered a string of defeats on high-profile issues. They are losing the battle to prevent oil drilling in Alaska's wild lands, and have failed to spark the public's imagination over global warming. Even the stridently ungreen George Bush has failed to galvanize the environmental movement. The solution, argue many elders of the sect, is to step back from day-to-day politics and policies and "energize" ordinary punters with talk of global-warming calamities and a radical "vision of the future commensurate with the magnitude of the crisis".

The article’s introduction leads the reader to expect:

Item 1 a staunch condemnation of the environmental movement;