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.

---

Definitions:

Meta-analysis

A statistical technique that combines the results of multiple scientific studies to arrive at a conclusion that has greater statistical power.

Double-blind Procedure

An experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment, thus ensuring that neither the expectations of the subjects nor those of the experimenters influence the results.

Representative Sample

A representative sample is a subset of a population that accurately reflects the members of the entire population, crucial for generalizing findings from research.

Representative Sample

A portion of a population that reliably mirrors the attributes of the entire group.