The following data refer to tomato yields for 4 different salinity levels:
Salinity | Yield | |||||
1.6 | 59.5 | 53.3 | 56.8 | 63.1 | 58.7 | 54.7 |
3.8 | 55.2 | 59.1 | 52.8 | 54.5 | 53.1 | |
6.0 | 51.7 | 48.8 | 53.9 | 49.0 | 52.0 | |
10.2 | 44.6 | 48.5 | 41.0 | 47.3 | 46.1 | 48.3 |
Do the data provide sufficient evidence to conclude that the distribution of yields differs by salinity?
Use a 10% level of significance (Populations are not normally distributed, use Kruskall-Wallis H-test).
Kruskal-Wallis Test: Yield versus Salinity
Kruskal-Wallis Test on Yield
Salinity N Median Ave Rank Z
1.6 6 57.75 18.2 2.95
3.8 5 54.50 15.0 1.37
6.0 5 51.70 9.6 -0.74
10.2 6 46.70 3.5 -3.54
Overall 22 11.5
H = 17.31 DF = 3 P = 0.001
Since p-value<0.1 so we conclude that the data provide sufficient evidence that the distribution of yields differs by salinity.
The following data refer to tomato yields for 4 different salinity levels: Salinity Yield 1.6 59.5...
The following data refers to yield of tomatoes (kg/plot) for four different levels of salinity. Salinity level here refers to electrical conductivity (EC), where the chosen levels were EC = 1.6, 3.8, 6.0, and 10.2 nmhos/cm. (Use i = 1, 2, 3, and 4 respectively.) 1.6: 59.7 53.5 56.2 63.7 58.8 3.8: 55.9 59.1 52.3 54.2 6.0: 51.3 48.8 53.6 48.5 10.2: 44.6 48.9 41.0 47.1 46.8 Use the F test at level a = 0.05 to test for any...