MTB > execute 'ml-11-8.mtb'
MTB > Note. Bill Qualls - WCC - BU107
MTB > Note. Mason & Lind, Chapter 11
MTB > Note. 7th edition, page 427, #8
MTB > Note. 8th edition, page 403, #12
MTB >  
MTB >  
MTB > Note. "Hugger Polls contents that an agent conducts 53
MTB > Note. in-depth home surveys every week. A streamlined
MTB > Note. survey form has been introduced, and Hugger wants
MTB > Note. to evaluate its effectiveness. The number of
MTB > Note. in-depth surveys conducted during a week by a
MTB > Note. random sample of agents are (in C1). At the .05
MTB > Note. level of significance, what do you conclude about
MTB > Note. the number of in-depth surveys completed during
MTB > Note. a week using the new form?"
MTB >  
MTB >  
MTB > set into c1
DATA> 53 57 50 55 58 54 60 52 59 62 60 60 51 59 56
DATA> end
MTB >  
MTB > name c1 'Surveys'
MTB >  
MTB > ttest mu=53 c1;
SUBC> alternative +1.

TEST OF MU = 53.000 VS MU G.T. 53.000

             N      MEAN    STDEV   SE MEAN        T    P VALUE
Surveys     15    56.400    3.738     0.965     3.52     0.0017

MTB >  
MTB >  
MTB > Note. Use the subcommand alternative +1 when Ha: mu >
MTB > Note. Use the subcommand alternative -1 when Ha: mu <
MTB > Note. Do not use a subcommand when Ha: mu not equal
MTB >  
MTB >  
MTB > Note. If the p-value is less than your à then reject Ho.
MTB > Note. Since the observed p-value (.0017) is less than the
MTB > Note. specified à level (.05), we reject the null hypothesis.
MTB > Note. (Include a conclusion of this type on your homework.)
MTB >  
MTB >  
MTB > Note. Find the 90% confidence interval:
MTB > tint 90 c1

             N      MEAN    STDEV  SE MEAN   90.0 PERCENT C.I.
Surveys     15    56.400    3.738    0.965  (  54.700,  58.100)

MTB >  
MTB >  
MTB > Note. The C.I. does not include the hypothesized mean (53).
MTB > Note. This is consistent with our conclusion to reject Ho.
MTB >  
MTB > stop
*** Minitab Release 8.21 *** Minitab, Inc. ***
Storage available 16174