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:

Correlational Method

A research strategy used to examine the relationship between variables, without implying causation.

Experimental Method

A scientific approach to research in which variables are manipulated to observe their effect on other variables, allowing for determination of cause-and-effect relationships.

Focus Group

A research method involving guided discussions with a group of people to gather diverse perspectives on a particular subject.

Positive Correlation

Positive correlation exists when two variables move in the same direction, meaning that as one variable increases, the other variable also increases.