I HC HU

I HC QUC GIA TP.HCMTRNG I HC BCH KHOA

-----(((((-----

BO CO BI TP LN

XAC SUT THNG KGVHD:TS. Nguyn Ba Thi

SVTH :Ng Hong Thun

MSSV:41203699

Nhom :A09-B

tai :5

TP.HCM, THNG 4 NM 2014

CU 1:

Bang sau ay cho ta phan bo thu nhap cua hai nhom tuoi: Nhom t 40 50 tuoi va nhom t 50 60 tuoi trong tat ca cac cong nhan vien chc cua Thuy ien nam 1930 (n v: 1000 curon)

Nhom tuoi

Thu nhap

0 11 22 33 44 6 6

40 507831267403557220009115276919

50 60 785820685241861228067764222

Co s khac nhau ve ty le thu nhap gia hai nhom tuoi nay khong? Mc y ngha = 1%.BI LMDng bi: SO SNH T S N GINGi thit: Ho: ty le thu nhap gia hai nhom tuoi ny ging nhau.Cch gii quyt: S dng hm CHITEST ca MS-Excel tnh P v so snh vi , c th:

P>: chp nhn gi thit Ho P: bc b gi thit HoQuy trnh gii trn Excel:

1) Nhp d liu vo bng tnh:

Tnh cc tng s:

Tng hng: chn H3 ri nhp =SUM(B3:G3), gi con tr ko k t t H3 xung n H4.

Tng ct: chn B5 ri nhp =SUM(B3:B4), gi con tr ko k t t B5 sang n G5.Tng cng: chn H7 ri nhp =SUM(B3:G4) Tnh tng cc tn s l thuyt:

Chn B16 ri nhp =$H3*B$5/$H$7, v ko cho tt c cc trong bng cho cc nhm tui 40 50; 50 60Ta c bng:

2) Tnh gi tr P:

Chn G15 v s dng hm =CHITEST(B3:G4;B12:G13)Bin lun: bc b HoKt lun: Vy ty le thu nhap gia hai nhom tuoi ny khc nhau.CU 2:

So kilomet i c nh 1 lt xang cua 4 loai xe oto A, B, C, D c ghi lai nh sau tren

cac xe chay th nghiem:

Loai A: 25, 23, 20, 27, 20 Loai B: 28, 31, 27, 28, 26

Loai C: 32, 33, 30, 28, 32 Loai D: 24, 24, 23, 27, 22

Vi mc y ngha = 5%, hay so sanh mc tieu thu xang trung bnh cua 4 loai xe noi tren.

BI LMDng bi: PHN TCH PHNG SAI MT NHN T.Gi thit : H0: mc tieu thu xang trung bnh bng nhau cua 4 loai xe.Cch gii quyt: p dng Anova: Single Factor ca MS-Excel tnh F v so snh vi F ,c th:

F Fcrit = 3,238872 ( bc b gi thit H0Kt lun: Vy mc tieu thu xang trung bnh cua 4 loai xe l khc nhauCU 3: Tnh ty so tng quan cua Y oi vi X ,he so tng quan va he so xac nh cua tap so lieu sau ay. Vi mc y ngha = 5%, co ket luan g ve moi tng quan gia X va Y (Co phi tuyen khong ? Co tuyen tnh khong ?).Tm ng hoi quy cua Y oi vi X.

X0,91,221,320,771,31,20,91,221,320,771,31,2

Y-0,30,10,7-0,28-0,250,020,30,50,4-0,2-0,30,08

BI LM

Dng bi: PHN TCH TNG QUAN V HI QUY.

Cch gii quyt: p dng Anova: Single Factor tinh SSF v SST t tnh c t s tng quan suy ra Fqs va so sanh vi c.

p dng Correlation tnh h s tng quan, h s xc nh, gi tr Tqs v so snh vi ngng c

p dng Liner Regression phn tch hi quy.

Quy trnh gii trn Excel:

1) Nhp gi tr vo bng tnh:

2) Tnh h s tng quan, h s xc nh ca Y i vi X, kt lun v mi tng quan tuyn tnh gia X v Y

Vo Data /Data analysis , chn Correlation:

Trong hp thoi Correlation ln lt n nh: Phm vi u vo: Input Range, qut vng ($A$1:$B$13). Cch nhm theo hang hay ct: Group By, chn Columns (nhm theo ct). Chn Labels in first row (nhn d liu hng u).Phm vi u ra: Output Range, chn D1

Nhn OK, ta s c bng kt qu sau:

Ta tm c h s tng quan r = 0.432996V h s xc nh r2 = 0,187485536Gi thit: Ho : X v Y khng c tng quan tuyn tnh.

Gi tr quan st: Tqs = 1,519036936M:

c = 2,228.

(c l phn v mc /2=0.025 ca phn b Student vi n-2=10 bc t do).Bin lun: V lTl < c nn ta chp nhn gi thit Ho.Kt lun: X v Y khng c tng quan tuyn tnh.3) Tnh t s tng quan ca Y i vi X, kt lun v mi tng quan phi tuyn gia X v Y:

Chuyn X, Y v dng bng:

Vo Data chn Data Analysis ri chn hp thoi Anova: Single Factor.

Trong hp thoi Anova: Single Factor ln lt n nh: Phm vi u vo: Input Range, qut vng ($B$1:$G$3). Cch nhm theo hng hay ct: Group By, chn Columns (nhm theo ct). Chn Labels in first row (nhn d liu nm hng u). Mc ngha : Alpha (n nh =0,05). Phm vi u ra: Output Range, chn A6Nhn OK, ta c bng sau:

SSF = 1,007042SST = 1,318292

Tnh:

2Y/X = SSF/SST = 0,76 => T s tng quan:Y/X =0,87 Gi thit Ho: X v Y khng c tng quan phi tuyn.

Ta c: F = 1,056930964 vi

M:

c = 4,46 k = 4(c l phn v mc =0,05 ca phn b Fisher bc t do (k-2,n-k)=(2,8)).

Bin lun: V F < c nn chp nhn gi thit Ho.Kt lun: X v Y khng c tng quan phi tuyn4) Tm ng hi quy ca Y i vi X

Vo Data chn Data Analysis ri chn hp thoi Regression

Tip tc, nhp cc thng s sau:

Phm vi u vo (Input Range).

Nhn d liu (Label)

tin cy (Alpha)

Phm vi u ra (Output Range).

Nhn OK ta c bng sau:

Ta xc nh c b = -0,71, a = 0,69Kt lun: Vy phng trnh hi quy ca Y vi X l: y = -0,71 + 0,69x

CU 4:

Hay phan tch tnh hnh kinh doanh cua mot so nganh nghe 4 quan noi thanh

tren c s so lieu ve doanh thu cua mot so ca hang vi 3 lan quan sat nh sau (mc

y ngha 10%):Nganh nghe kinh doanhKhu vc kinh doanh

Q1Q2Q3Q4

ien lanh

Vat lieu xay dng

Dch vu tin hoc5.7:6.1:6.6

5.0:5.2:5.4

3.8:4.1:3.9

3.1:3.3:3.0

15.0:14.4:15.6

1.8:2.0:1.9

4.2:4.6: 4.4

9.5:8.8:9.8

1.3:1,5:1.4

5.0:5.2:5.5

17.5:17.2:18

4.8:4.6:4.9

EMBED Equation.DSMT4

14

_1458896729.unknown

_1458897988.unknown

_1458901289.unknown

_1458896730.unknown

_1458896728.unknown

_1436722624.unknown