In 2003, Computers of Brand a Controlled 25% of the Market

question 15

Essay

In 2003, computers of Brand A controlled 25% of the market, Brand B 20%, Brand C 10% and Brand D 45%. In 2004, sample data were collected from many randomly selected stores throughout the country. Of the 1200 computers sold, 280 were Brand A, 270 were Brand B, 90 were Brand C and 560 were Brand
D.Has the market changed since 2003? Test at the 1% significance level.

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Definitions:

Schema

A cognitive framework or concept that helps organize and interpret information, forming the basis of understanding experiences.

Secondary Circular Reactions

Secondary circular reactions are a developmental phase in infants, occurring around 4-8 months, characterized by the repetition of actions that produce effects outside the body, showing an early awareness of cause and effect.

Sensorimotor

The first stage in Piaget's theory of cognitive development, where infants learn through interacting with the environment, from birth to about 2 years of age.

Concrete Operational

A stage in cognitive development, according to Piaget, where children gain the ability to think logically about concrete events.