Asanka -Assignment Biostatistics - PB 402 BASIC STATISTICS...

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PB 402: BASIC STATISTICS - Assignment A . R . GODAKANDA (Msc/PGIS/PB/16/04) Q : 02 H0 ; µ 0 month = µ 1 month = µ 2 month = µ 3 month H1 ; µ 0 month µ 1 month µ 2 month µ 3 month Test stat ; One-way ANOVA: weight versus Month Source DF SS MS F P Month 3 25.22 8.41 5.35 0.008 Error 19 29.83 1.57 Total 22 55.04 S = 1.253 R-Sq = 45.81% R-Sq(adj) = 37.25% Cal P value 0.008< 0.05 Conclusion : At the 0.05 level, we do reject the null hypothesis and say that the mean calcium content of wheat was not the same in each storage time. Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev +---------+---------+---------+--------- 0 6 57.492 1.373 (--------*--------) 1 6 57.938 1.334 (--------*--------) 2 6 59.553 0.897 (--------*--------) 3 5 60.012 1.368 (---------*---------) +---------+---------+---------+--------- 56.4 57.6 58.8 60.0
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Q : 03 Q : 04 (1) Source DF SS MS F P TREAT 2 1484.9 742.5 11.27 0.002 Error 12 790.8 65.9 Total 14 2275.7 S = 8.118 R-Sq = 65.25% R-Sq(adj) = 59.46% F = 11.27 (2,12) & P= 0.002 < 0.05 (2)H0 = µ PLACEBO = µ LOW DOSE = µ MODERATE DOSE No difference in depression levels between the three groups. Groups taking the drug won’t be different than the groups taking the placebo. (3)H1: µ PLACEBO≠ µ LOW DOSE ≠ µMODERATE DOSE Somehow there will be a difference in depression levels due to the
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