Assignment Task

 

Table 1. Shows the average (Mean) percentage of ash content in each type of date (Rabi’aa, Medjool, Khodary, Khalas) gram / per 100 grams, and standard deviation of the values. Also, shows the 95% confidence interval upper and lower bounds.

 

Lower Bound Upper Bound

  • ASH Rabi'aa 2.387467 0.191945 2.155 2.62
     
  • Medjool 2.168967 0.11548 1.936 2.402
     
  • Khodary 2.597533 0.25032 2.365 2.83
     
  • Khalas 2.2759 0.09791 2.043 2.509

 

Table 1. above shows the main descriptive statistics after combustion of each date fruit type, Rabi’aa, Medjool, Khodary, and Khalas. The procedure was repeated three time for each type of date fruit to provide an accurate mean value [(Rabi’aa= 2.387), (Medjool= 2.169), (Khodary= 2.734), (Khalas= 2.276)] (SD= 0.223). A MANOVA analysis was used to test the hypothesis of this research which is that there is a significant difference between the date fruits in the ash percentage. The analysis showed that there was no significant difference per 100 grams of each type (p= 0.079) from the Post hoc comparison test using Bonferroni adjustment, recorded degrees of freedom was [F (3,8) = 3.291]. In addition, table 1 demonstrates 95% confidence interval upper and lower of each date fruit type 95% CI [(Rabi’aa =1.910, 2.864) (Medjool= 1.882, 2.456) (Khodary= 2.585, 2.883) (Khalas= 2.033, 2.519)].

In table 2, it was also noticed that Khodary and Medjool date had smallest p value among the 4 date types analysed, (p= 0.17). However, Medjool and Khalas dates recorded the highest p value in ash percentage where (p= 0.476) as it was shown in the pairwise comparison table in appendix. These findings support the hypothesis of the research.

 

 

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  • Posted on : March 23rd, 2019

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