Last Year, Brand a Mobile Android Phones Had 45% of the Market

question 1

Essay

Last year, Brand A mobile android phones 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 mobile phone stores shows that of the 10,000 android mobile phones sold, 4350 were Brand A, 3450 were Brand B, and 2200 were Brand
C.Has the market changed? Test at $\alpha =$ 0.05.

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Definitions:

Marginal Cost

The cost of producing one additional unit of a product, often used in decision-making processes regarding production levels.

Average Total Cost

The total cost of production divided by the quantity of output produced; it includes all variable and fixed costs.

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U.S. government programs that provide health insurance to the elderly, disabled (Medicare) and individuals/families with low income (Medicaid).

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Government-provided insurance programs designed to offer health coverage to eligible individuals, aiming to improve accessibility and affordability.