In 2011, Brand A MP3 Players had 45% of the market, Brand B had 35%, and Brand C had 20%. This year the makers of brand C launched a heavy advertising campaign. A random sample of electronic stores shows that of 10,000 MP3 Players sold, 4,350 were Brand A , 3,450 were Brand B , and 2,200 were Brand C . Has the market changed? Test at a = 0.01.

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The Answer of In 2011, Brand A MP3 Players had 45% of the market, Brand B had 35%, and Brand C had 20%. This year the makers of brand C launched a heavy advertising campaign. A random sample of electronic stores shows that of 10,000 MP3 Players sold, 4,350 were Brand A , 3,450 were Brand B , and 2,200 were Brand C . Has the market changed? Test at a = 0.01.

In 2011, Brand a MP3 Players Had 45% of the Market