Question

MNM, Inc. has three stores located in three different areas. Random samples of the daily sales of the three stores (in $1,000) are shown below.

Store 1	Store 2	Store 3
9	10	6
8	11	7
7	10	8
8	13	11

At a 5% level of significance, test to see if there is a significant difference in the average sales of the three stores.

Answer 1

let us consider

H0: average sales are same

H1: at least two average sales are not same

using excel>data analysis>one way anova

Anova: Single Factor
SUMMARY
Groups	Count	Sum	Average	Variance
Store 1	4	32	8	0.666667
Store 2	4	44	11	2
Store 3	4	32	8	4.666667
ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	24	2	12	4.909091	0.036182	4.256495
Within Groups	22	9	2.444444
Total	46	11

since p value 0.036182 <0.05 so we reject the null hypothesis and conclude there is a significant difference in the average sales of the three stores.