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

question 64

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:

Abnormal Psychology

The area of psychology focused on examining atypical forms of behavior, emotions, and thought processes, which could potentially lead to the identification of a mental disorder.

Open Spaces

Areas of land, typically undeveloped, reserved for recreation, leisure, or preservation, often contributing to community health and well-being.

Dysfunction

An impairment or abnormal functioning of a bodily system or organ.

Bedlam

Historically, a term associated with chaos and confusion, originally referred to London’s Bethlem Royal Hospital, an asylum known for its poor conditions and treatment of the mentally ill.