Nguai bier) soan de TM:re/NG DA1HQC VAN LANG KHOA KII0A HOC CO BAN (Kti trA ghi tO hp ton) Ma de: De thi: De 1: De 2: IA Man thi: ThOng ke ang dyng kinh vã kinh doanh KW:la/Lap: K24TC - Hoc ky: - Nam hoc: 2019-2020 1-47 :-/k0112Trueng Khoa/B6 mem uyet (K5 tra ghi hp t Thai gian thi: 45 phut U; 60 phut 0; 75 phia GS; 90 phat U; 120 phut Trac nghiem U Hinh thirc thi: Ty Juan Ty luan + TrAc nghiem D - Kh8ng sir dung tai lieu El Dirac sir clung tai lieu - (Dap On chi trinh bay m(5i each gicii, ccic ccich gicii khac &Mg GIL Ave diem idi cla) Bai (3 diem): CO tai lieu ve tin lucrng (don vi tinh: trieu deng/thang) cilia met so ding nhan hai to san xuat nhu sau: T6 A 7 8 9 T6 B 10 9 14 Tinh cac dc thing ve.trung binh, trung vi, phuang sai mu hieu chinh, dO lech mu hieu chinh, de lech tuyet doi binh quan ye tien luang cUa cong nhan & t8 A Tinh cac dc trung ve trung binh, trung vi, phuang sai mu hieu chinh, lech mk hieu chinh lech tuyet doi binh quan ye den lucmg cat ding nhan a to B Ciãi btu ft: slut? %len co !ha sn clang mciy tinh lay clo tini !rung binh, phttang sai vet ctO l'Och chucin hieu chinh a) Gqi X IA tie') Itrang cUa nhan vier) & to A T6 A 7 8 9 — X +X 1- +X„= 6+7+ +9 = 7,6 (trieu dOng/thang)(0,25 diem) Trung binh: X = 10 n Trung vi: Sap xep dir lieu thee thir us tang dan: 6, 7, 7, 7, 8, 8, 8, 9, 7+8 X +X X ,+X , 6— — (0,5 diem) Med(X)— 2 Phuang sai au hieu chinh: n 10 -(RY) =- (58,6 -7,6 ) = 0,9333 9` n -1 ( DO lOch mAu bleu chinh: S = 0,9661 (0,25 diem) DO lech tuyet del binh clam il = 180 =0,8 (0,25 diem) = (0,25 diem) b) Ggi Y la tin lucrng nhan vien cUa t6 B TB 10 9 14 Trung binh: F Y,+Y2 + +Y„ 6+5+ +14 =7,6 10 Trung Sap xep &Cr lieu theo thir bi tang dan: 4, 5, 5, 6, 6, 8, 9,9, 10, 14 Y 1,+Y ,,„, x, +x6 6+8 Med (Y) = " =• = =7 2 Phucmg sai mAu hieu chinh: — Y +y,2 + +Y; +52 + +14' Y =66 10 = n (Y (0,25 diem) (0,5 diem) -(66-7,61 )= 9,1556 DO lech matt hieu chinh: S= 3,0258 n -1 (0,25 diem) (f) ) = 1° DO lech tuyet d& binh quan: (0,25 diem) 24 = — = 2,4 (0,25 diem) 10 Hal (5 diem) Khao sat doanh thu (dcrn tti tinh: trieu dang/thang) cUa mot sa ct.th hang Mat pito, ta thu dugc bang so lieu sau: Doanh thu ( x, ) 200 250 300 350 400 450 500 SO dra hang (n,) 10 20 30 40 35 15 Vgi dO tin clay ph6 Val dO tin cay 95%, hay tim khoang trete hiving cho tY l cira hang c6 doanh thu tir 400 trieu thing/ thang tr.& len Co tai lieu noi rang: TS, IG cfra hang c6 doanh thu dual 350 trieu dong/thang la 35% Veri Sic nghia 5%, hay cho nhan xet ve tai lieu tren GUM Ti r bang so lieu ta tinh dugc: n=158, x =346,5190, s= 76,3659 (0,5 diem) a) Khoang trecluvng cho doanh thu trung binh cua mOt dra hang Gs ph& Ggi i la doanh thu trung binh cUa met cfra hang (0,25 diem) Tit 1-cc= 0,95 zar, =1,96 (0,25 diem) DO chinh xac: s 76 3659 S = z — =1 96 ',— =11,9077 "12 it; V158 Khoang ugc higng can tim: (0,25 diem) (x±s)= (346,5190-11,9077;346,5190 +11,9077) = (334,6113;358,4267) (trieu dang/thang) Vay vai tin cay 95%,, khoang uoc Itrang doanh thu trung binh cOa m6i ara hang a tir 334,6113 trieu dong/thang den 358,4267 trieu &Mg/ thang (0,25 diem) b) Khoang trac luang tY le dra hang c6 doanh thu tic 400 trieu d6ng/ thang vet len Cira hang c6 doanh thu tir 400 trieu deing/ thang tit len Doanh thu ( x, ) 400 450 500 S6 ara hang (11,) 35 15 G9i p IA ty le cira hang c6 doanh thu Ur 400 trieu &Mg tr6 len m 29 Theo bang so lieu: n = 158 va m = 58 nen = — = -= — n 158 79 Tir I — a = 0,95 =1,96 (0,25 diem) (0,25 diem) (0,25 diem) 29(1 _29) DO chinh xac: e = If — f) al =, 1961 79 Khoang ink hieing cAn tim: (f ± a) 79 ) 158 0,0752 (0,5 diem) 29 = (- ± 0,0752) = (0,2919;0,4423) 79 Val dO tin cOy 95% ty le cira hang c6 doanh thu Ur 400 trieu deng/thang tra len IA 29,19% den 44.23% (0,25 ditm) c) Kiem clinh gia thuyet ye tY le dm hang co doanh thu clued 350 trieu deng/thang Cm hang c6 doanh thu dual 350 trieu dong/thang Doanh thu ( v, ) 200 250 300 S6 ciia hang ( Il i ) 10 20 30 Goi p ty I dra hang c6 doanh thu duel 350 trieu d8ng/ thang • 60 30 Tit bang s6 ta cO: n = 158 m = 60 nen j 158 79 11:14t f1„ p = 0,35 va H , : p # 0,35 Tir = 0,05 7.„„ =1,96 Gia tri tieu chub kiem dinh: 30 — —0,35 f — P0 79 :— = 0,7839 p„ (I — p o ) 10,35(1 —0,35) l n (0,25 di'm) (0,5 dim) (0,25 di'm) (0,5 diem) 158 Vi 1:1= 0,7839 < z u„ = 1,96 nen chua &I co so de bac 1)6 Ho (0,25 di&T) Ket luan: Chua di) co six de bac b6 ty le cira hang c6 doanh thu dual 350 trieu &mg/ thang ta 35% (0,25 diem) BM (2 diem) Doanh s6 ban (dun vi tinh: ty &mg) cOa melt c6ng ty thucrng mai duce ghi nhan bang sau: NAm 2010 2011 2012 2013 2014 2015 2016 2017 _ Doanh so ban 25 40 53 60 72 80 95 100 Tim doanh sO ban trung binh, toc dO phat trien trung binh, lugng tang/giam tuyet d8i trung binh Dcr bao doanh so ban cila c8ng ty nam 2018 bang phuang phap !yang tang/giam tuyet dal trung binh, t6c di phat trien trung binh Giii a) Tim tim doanh s8 ban trung binh, tOc del phat trier' trung binh,lugng tang giarn tuyet dôi trung binh Y + +Y, 25+ + 100 =65,625 (0,5 diem) '= Doamh so ban trung binh: Y = = 100 1-s 25 1,2190 -11 Tee phat trien trung binh: ; =nI \ -Y, (0,25 diem) = 100-25 =10,7 143 (0,25 diem) 8-1 n -1 b) Dy bao doanh sO ban clia cong ty nam 2018 bang phuang phap luang tang giam tuyOt &I trung binh, toc del phat trien trung binh Dv bao bang phucmg phap lucmg tang giam tuyet doi: (0,5 dim) 5)8+1 =100 +10,7143x1=110.7143 (tydang) ^Y,24, = Y n -1- &h Dv bao bang t6c di) phat trien trung binh: Luvng tang giam tuyet doi trung binh: 35n+h = y n (O h = Y" -31' 5,8+1 =100(1,2190Y =121,90 (tS, dOng) (0,5 diem) Nguiri son Le Thi Hang Thuy