In 2011,computers of Brand a Controlled 25% of the Market,Brand

question 91

Essay

In 2011,computers of Brand A controlled 25% of the market,Brand B 20%,Brand C 10%,and brand D 45%.In 2015,sample data was collected from many randomly selected stores throughout the country.Of the 1,200 computers sold,280 were Brand A,270 were Brand B,90 were Brand C,and 560 were Brand D.Has the market changed since 2011? Test at the 1% significance level.

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Definitions:

Depression

A syndrome identified by steady depressive emotions or lack of motivation in previously enjoyed activities, significantly impairing routine life operations.

Sleep Deprivation

Refers to the condition of not having enough sleep, which can lead to a variety of physical and mental health issues.

Concentration

The action or power of focusing one's attention or mental effort on a specific object, task, or activity without getting distracted.

Irritability

A state of increased sensitivity or annoyance, often resulting from stress or fatigue.