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Bi 1Trong mt cuc iu tra ca cng ty X, 200 ngi c hi l H cm thy nh th no v hiu qu ca Chng trnh ci tin cht lng phc v ti cng ty ?. Kim tra mi lin h gia Hc vn v Kt qu nh gi. Bit = 0,05. Kt qu nh sau:
Hc vnChng trnh ci tinHiu quKhng hiu qu< Trung hc88TH + t nht 1 nm C5035Tt nghip C1758> C520
Bi 2Kim tra thi gian phc v (pht) ca 10 khch hng trc v sau ci tin. Bit thi gian phc v khng tun theo quy lut phn phi chun. Hy s dng phng php kim nh thch hp kim tra xem chng trnh ci tin c thc s hiu qu khng ? Bit = 0,05.
Khch hngTrcSau16063240383787745350567746889677780F-Test Two-Sample for Variances8607096465TrcSau107575Mean66.268.8Variance194.6222222222261.0666666667Observations1010df99F0.7454885938P(F0.05F Critical one-tail0.3145749062
t-Test: Paired Two Sample for Means
TrcSauMean66.268.8Variance194.6222222222261.0666666667Observations1010Pearson Correlation0.9668336024Hypothesized Mean Difference0df9t Stat-1.8467035229P(T