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QNT/351

Question 1

Last week we discussed the one sample hypothesis test. This week we will discuss ANOVA. The ANOVA allows us to test the mean between ; two or more groups.

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;Teachers Example, I have five pizza delivery areas and I want to know if the average sales per run is different in one area than any of the other areas.

H0: There is no significant difference in the sales per run between the delivery areas

H1: There is a significant difference in the sales per run between the delivery areas

Notice how the hypothesis is very simple. There is a difference or there is not a difference. Again, we will use MegaStat. You cannot calculate ANOVA by hand.

Just put your own sales for each area in a column and click the Megastat menu, select analysis of variance, and highlight your data and click enter. Check your p-value. Interpret.

Here is the teachers example :

; ; ; Area 1 ; ;Area 2 ; ; Area 3 ; Area 4 ; ;Area 5

;$ ; 45.00 ; $ ; 13.00 ; $ ; 12.00 ; $ ; 34.00 ; $ ; 37.00

;$ ; 34.00 ; $ ; 24.00 ; $ ; 37.00 ; $ ; 25.00 ; $ ; 22.00

;$ ; 36.00 ; $ ; 34.00 ; $ ; 27.00 ; $ ; 23.00 ; $ ; 32.00

;$ ; 45.00 ; $ ; 23.00 ; $ ; 17.00 ; $ ; 36.00 ; $ ; 42.00

;$ ; 53.00 ; $ ; 32.00 ; $ ; 28.00 ; $ ; 23.00 ; $ ; 35.00

;$ ; ;43.00 ; $ ; 21.00 ; $ ; 39.00 ; $ ; 35.00 ; $ ; 37.00

;$ ; 45.00 ; $ ; 23.00 ; $ ; 35.00 ; $ ; 45.00 ; $ ; 28.00

;$ ; 65.00 ; $ ; 24.00 ; $ ; 26.00 ; $ ; 34.00 ; $ ; 13.00

;$ ; 32.00 ; $ ; 37.00 ; $ ; 45.00 ; $ ; 23.00 ; $ ; 24.00

;$ ; 30.00 ; $ ; 45.00 ; $ ; 27.00 ; $ ; 53.00 ; $ ; 15.00

;$ ; 40.00 ; $ ; 32.00 ; $ ; 34.00 ; $ ; 29.00 ; $ ; 63.00

;$ ; 23.00 ; $ ; 34.00 ; $ ; 16.00 ; $ ; 28.00 ; $ ; 35.00

; ; ; ; ; ; ;

One factor ANOVA ; ; ; ; ; ;

; ; ; ; ; ; ;

; Mean ; n ; Std. Dev ; ; ; ;

32.45 ; 40.917 ; 12 ; 11.1719 ; Area 1 ; ; ;

32.45 ; 28.500 ; 12 ; 8.6707 ; Area 2 ; ; ;

32.45 ; 28.583 ; 12 ; 9.9951 ; Area 3 ; ; ;

32.45 ; 32.333 ; 12 ; 9.3355 ; Area 4 ; ; ;

32.45 ; 31.917 ; 12 ; 13.3448 ; Area 5 ; ; ;

; 32.450 ; 60 ; 11.2347 ; Total ; ; ;

; ; ; ; ; ; ;

ANOVA table ; ; ; ; ; ; ;

Source ; SS ; ; df ; MS ; F ; ; p-value ;

Treatment ; 1,230.4333 ; 4 ; 307.60833 ; 2.72 ; .0386 ;

Error ; 6,216.4167 ; 55 ; 113.02576 ; ; ; ;

Total ; 7,446.8500 ; 59 ; ; ; ; ;

; ; ; ; ; ; ;

The p-value is less than .05 so I do not reject the null

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