Multifactor ANOVA - diem trung binh
Dependent variable: diem trung binh (0)
Factors:
nong do (ppm)
thoi gian (phut)
Number of complete cases: 12
The StatAdvisor
This procedure performs a multifactor analysis of variance for diem trung binh. It constructs various tests and graphs to determine which factors have a statistically significant effect on diem trung binh. It also tests for significant interactions amongst the factors, given sufficient data. The F-tests in the ANOVA table will allow you to identify the significant factors. For each significant factor, the Multiple Range Tests will tell you which means are significantly different from which others. The Means Plot and Interaction Plot will help you interpret the significant effects. The Residual Plots will help you judge whether the assumptions underlying the analysis of variance are violated by the data.
Analysis of Variance for diem trung binh - Type III Sums of Squares
Source Sum of Squares Df Mean Square F-Ratio P-Value
MAIN EFFECTS
A:nong do 51,5476 3 17,1825 8,92 , 125
B:thoi gian 24,3164 2 12,1582 6,31 , 335
RESIDUAL 11,563 6 1,92716
TOTAL (CORRECTED) 87,4269 11
All F-ratios are based on the residual mean square error.
The StatAdvisor
The ANOVA table decomposes the variability of diem trung binh into contributions due to various factors. Since Type III sums of squares (the default) have been chosen, the contribution of each factor is measured having removed the effects of all other factors. The P-values test the statistical significance of each of the factors. Since 2 P-values are less than ,05, these factors have a statistically significant effect on diem trung binh at the 95,0% confidence level.
Table of Least Squares Means for diem trung binh with 95,0 Percent Confidence Intervals
Stnd. Lower Upper
Level Count Mean Error Limit Limit
GRAND MEAN 12 15,785
nong do
0 3 19,29 ,801491 17,3288 21,2512
10 3 15,2567 ,801491 13,2955 17,2178
30 3 14,6033 ,801491 12,6422 16,5645
50 3 13,99 ,801491 12,0288 15,9512
thoi gian
5 4 17,6125 ,694112 15,9141 19,3109
10 4 15,6025 ,694112 13,9041 17,3009
15 4 14,14 ,694112 12,4416 15,8384
The StatAdvisor
This table shows the mean diem trung binh for each level of the factors. It also shows the standard error of each mean, which is a measure of its sampling variability. The rightmost two columns show 95,0% confidence intervals for each of the means. You can display these means and intervals by selecting Means Plot from the list of Graphical Options.
Multiple Range Tests for diem trung binh by nong do
Method: 95,0 percent LSD
nong do Count LS Mean LS Sigma Homogeneous Groups
50 3 13,99 ,801491 X
30 3 14,6033 ,801491 X
10 3 15,2567 ,801491 X
0 3 19,29 ,801491 X
Contrast Sig. Difference +/- Limits
0 - 10 * 4,03333 2,77353
0 - 30 * 4,68667 2,77353
0 - 50 * 5,3 2,77353
10 - 30 ,653333 2,77353
10 - 50 1,26667 2,77353
30 - 50 ,613333 2,77353
* denotes a statistically significant difference.
The StatAdvisor
This table applies a multiple comparison procedure to determine which means are significantly different from which others. The bottom half of the output shows the estimated difference between each pair of means. An asterisk has been placed next to 3 pairs, indicating that these pairs show statistically significant differences at the 95,0% confidence level. At the top of the page, 2 homogenous groups are identified using columns of X's. Within each column, the levels containing X's form a group of means within which there are no statistically significant differences. The method currently being used to discriminate among the means is Fisher's least significant difference (LSD) procedure. With this method, there is a 5,0% risk of calling each pair of means significantly different when the actual difference equals 0.
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