(9pt) A stock market analyst wants to determine if the recentintroduction of the IPhone 8x has changed the distribution ofshares in the cellphone market. The analyst collects data from arandom sample of 300 cellphone customers. The table below shows theobserved customers’ share of cellphones (fi ). When using thisrandom sample, the analyst needs to be 95% confident of testresults. The hypothesis to be tested follows: H0 : Plg =0.20; Pa=0.32; Ps =0.48 ; market shares have remained same Ha : Plg ?0.20;Pa ?0.32; Ps ?0.48 ; market shares have changed Cellphone companyCurrent Market Share Observ. fi Samsung 0.48 100 Apple 0.32 120 LG0.20 80 Totals 300 a. (6pt) Compute the test statistic for achi-squared test. b. (3pt) After the test, would you conclude thatthe introduction of the IPhone 8x has changed the marketcomposition? Why?
