In a national survey on substancein a national survey on substance abuse commaabuse, modifying 66.4 % with underline66.4% of respondents who were full dash timeof respondents who were full-time college students aged 18 to 22 reported using alcohol within the pastcollege students aged 18 to 22 reported using alcohol within the past month. month. nothing is the value a parameter or a statistic?

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?