試題詳解

19. In country A, according to past experiencc, 40% of video gare consoles sold were PS4, 10% were xbox I and 50% were Switch. To maintain the inventory of each type of video game consoles, Tony conducts a survey and gather a random sample of 100 sales of video game consoles and finds that 30 of them are PS4, 30 are xbox I and 40 are switch. To test whether past pattern of sales of video gamne consoles still prevails, Tony uses the chi-square test with 1% level of significance. Let denote the ath quantile of a chi-square random variable with degree of freedom k:
(A) The value of the test statistic is 44.5 and the critical value used should be (0.99).
(B)The value of the test statistic is 17.83 and the critical value used should be (0.995)
(C) The value of the test statistic is 42 and the critical value used should be (0.99).
(D)The value of the test statistic is 45.33 and the critical value used should be  (0.99).
(E)The value of the test statistic is 45.33 and the critical value used should be (0.995)