MTB > execute 'ml-11-14.mtb'
MTB > Note. Bill Qualls - WCC - BU107
MTB > Note. Mason & Lind, Chapter 11
MTB > Note. 7th edition, page 436, #14
MTB > Note. 8th edition, page 412, #22
MTB > Note.
MTB >  
MTB > Note. "The management of Levine Furniture, a chain of
MTB > Note. stores in the Northeast, designed an incentive
MTB > Note. plan for salespeople. To evaluate this innovative
MTB > Note. plan, 12 salespeople were selected at random, and
MTB > Note. their average daily income before and after the
MTB > Note. plan was recorded. Was there a significant increase
MTB > Note. in the salesperson's daily income due to the
MTB > Note. innovative incentive plan? Use the .05 level.
MTB > Note.
MTB >  
MTB > read into c1-c2
DATA> 320 340
DATA> 290 285
DATA> 421 475
DATA> 510 510
DATA> 210 210
DATA> 402 500
DATA> 625 631
DATA> 560 560
DATA> 360 365
DATA> 431 431
DATA> 506 525
DATA> 505 619
DATA> end
     12 ROWS READ
MTB >  
MTB > name c1 'Before' c2 'After' c3 'Diff'
MTB >  
MTB > let c3 = c2 - c1
MTB >  
MTB > ttest mu=0 c3;
SUBC> alternative +1.

TEST OF MU =  0.000 VS MU G.T.  0.000

             N      MEAN    STDEV   SE MEAN        T    P VALUE
Diff        12    25.917   40.791    11.775     2.20      0.025

MTB >  
MTB > stop
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