[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

BI BO CO PHP TH A NOT A I. MC CH TNH HUNG Mc ch: Phng php A not A cho php xc nh liu mt sn phm c ging vi mt sn phm chun (A) hay khng (not A). Phng php ny rt thch hp trong tnh hung bn mun kim tra xem sn phm mnh lm ra c ging vi mt sn phm ang bn trn th trng hay khng. Ngoi ra php th ny cn dng cho cc sn phm c mi v mnh hay lu v mnh, sn phm c hnh dng bn ngoi khc nhau. Tnh hung: Mt nh sn xut bnh Snack mun thay i cng ngh ng gi (s thay i ny nh hng ln cht lng bnh). Vi mc ch xc nh liu cng ngh mi ny to nn sn phm c cht lng tng ng vi nhng sn phm ca cng ngh trc. Nh sn xut thm d th trng bng cch xy dng th nghim nh gi cm quan vi php th A not A. Vi A l sn phm ca cng ngh hin ti, not A l sn phm ca cng ngh mi. II. NGUYN LIU Nh sn xut: Cng ty c phn Liwayway Vit Nam Tn sn phm: Oishi Loi: Bnh Snack Phomt ming premium cheese vi khi lng tnh 28gr. Ngy sn xut: 12/08/2011 Hn s dng: 6 thng k t ngy sn xut. Hng dn s dng: sn phm n lin, khng cn qua ch bin hoc x l thm. S lng: 5 bch. M t sn phm:-

Thnh phn: Mi v: Mu sc:

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III.NGI TH Ngi th khng cn c hun luyn nh gi cc tnh cht cm quan c th. Ngi th c yu cu cho bit hai mu c nhn bit ging nhau hay khc nhau. S lng ngi th: 12 ngi IV. PHNG PHP Chun b mu:1

[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

Mu A (c k hiu l A): L nhng mu bnh cn nguyn vn, c ly khi bao b ngay trc khi c a n ngi th. Mu Not A (c k hiu l B): L nhng mu bnh cn nguyn vn, c ly khi bao b khong 2 gi ng h trc khi c a n ngi th. S lng mu: 2 ming bnh/a/mu Cc dng c khc: Tem nhn: 36 ming nhn (12 tem c ghi mu A, 24 tem c ghi s m ha) Ly nha loi 50ml: 12 ly a nha nh: 36 a Nc lc: 2 lt Khn giy, khn lau bn, bng keo trong, vit, giy. iu kin phng th nghim: Thng gi, khng c mi l, nhit phng, nh sng thng thng ca vn phng. M ha mu: A B 623 741 569 657 348 162 796 506 894 412 983 527 645 509 514 631 558 186 929 515 629 919 438 348

Trt t trnh by mu:-

AA/BB/AB/BA Ngu nhin S ln xut hin ca mu A - Not A l nh nhau. TRT T AA BB AB BA M S NGI TH 1 2 3 4 M HA MU 623 569; 348 796; 894 983 741 657; 162 506; 412 527 645 509; 514 631; 558 186 515 929; 919 629; 348 438 TRT T AB BA BA AB M HA MU 645 509 515 929 919 629 514 6312

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[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

5 6 7 8 9 10 11 12 Phiu hng dn:

BA AA BB AA BB AB AA BB

348 438 623 569 741 657 348 796 162 506 558 186 894 983 412 527

PHIU HNG DN Bc 1: Hc cch nhn bit mu A Xin gii thiu vi cc bn mt mu chun bnh Snack. u tin xin bn vui lng thanh v bng nc lc trc khi th mu. Sau mi bn dng th mu v hy xc nh, nhn bit v mu bnh Snack ny. Bc 2:-

C 2 mu bnh Snack s c gii thiu vi bn. Xin bn vui lng thanh v bng nc lc trc khi th tng mu. Hy xc nh tng mu v nh gi c phi l mu m bn c hc cch nhn bit u bui th (A) hay l mt loi bnh Snack khc (not A). in m s ca mu v nh du cu tr li ca bn vo v tr thch hp. Hy a ra cu tr li cho ngay c khi bn khng chc chn.

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CH : C th a s bnh Snack gii thiu cho bn tng ng vi loi A hoc not A. Thc ra cch sp xp mu c thc hin mt cch ngu nhin v khc nhau i vi tng ngi th. V th bn khng phi bn tm v cu tr li trc ca bn. Bn s s dng mt phiu tr li cho mt mu, v phi a ngay cho ngi iu khin th nghim khi bn in xong cu tr li. Chn thnh cm n bn tham gia bui cm quan!

Phiu tr li:

3

[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

PHIU TR LI M s ngi th: . Bnh Snack c m s . l bnh Snack: Ngy://. A not A Vui lng nh du cu tr li ca bn vo v tr thch hp.

V. KT QU & BN LUN Thu nhn s liu th: Ng th la chn TRT T AB BA BA AB BA AA BB AA BB AB AA BB M HA MU 645 509 515 929 919 629 514 631 348 438 623 569 741 657 348 796 162 506 558 186 894 983 412 527 558 894 623 657 348 A 645-509 515 919 631 929 629 514 348 438 569 741 796 162 506 186 983 412 527 NOT A

M S NGI TH 1 2 3 4 5 6 7 8 9 10 11 12

Mu gii

Ngi th la chn l

Tng

4

[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

thiu Mu A

A 5 0

NOT A 1 6 4 3 14 24 12 12

Mu NOT A

2 3

Tng

10

X l s liu v kt lun: S dng chun 2 tnh ton: 2 = Trong : O: Tn s quan st c. E : Tn s l thuyt. E = ( Tng ct * tng hng)/tng chung Gi tr E dng u tin l : E=10 * 12 =5 24

(O E ) 2E

Gi tr dng sau l: E=14 * 12 =7 24

Theo cch tnh ny ta thu c bng cc gi tr l thuyt E nh sau: Mu gii thiu Mu A 5 Ngi th la chn l A 7 NOT A 125

Tng

[NHM 16 T 2]

[THC HNH CM QUAN]

GVHD: TRN TH THU H

Mu NOT A Tng

5 10

7 14

12 24

2 =

( 5 5 ) 2 + ( 5 5) 2 + ( 7 7 ) 2 + ( 7 7 ) 25 5 7 7

=0

3 Kt lun: Gi tr 2 tnh ton