The retailing manager wants to determine whether product location has any effect on the sale of products or its only Brand Spinney’s which has an impact. Three different locations are considered: Location A, Location B and Location C. A random sample of 18 stores is selected, with 6 stores randomly assigned to each aisle location. The size of the display area and price of the product are constant for all the stores. At the end of the one-month trial period, the sales volumes (in thousands of dollars) of the product in each store were as shown:
Summary stats for samples
Location A
Location
B
C
Sample sizes
6
Sample means
7.467
3.467
5.133
Sample standard deviations
1.648
0.653
1.418
Sample variances
2.715
0.427
2.011
Weights for pooled variance
0.333
Number of samples
3
Total sample size
18
Grand mean
5.356
Pooled variance
1.717
Pooled standard deviation
1.310
One Way ANOVA table
Source
SS
df
MS
F
p-value
Between variation
48.444
2
24.222
14.105
0.0004
Within variation
25.760
15
Total variation
74.204
17
Confidence intervals for mean differences
Confidence level
95.0%
Tukey method
Difference
Mean diff
Lower
Upper
Location A - Location B
4.000
2.037
5.963
Location A - Location C
2.333
0.370
4.297
Location B - Location C
-1.667
-3.630
0.297
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