CHICKEN FEED ADDITIVE STUDY Instruction: For all test of hypotheses, write Ho and Ha in words, specify test  procedure, show computed test statistic with df (if applicable), p-value, decision and conclusion.A study was conducted to determine the effect of different types of feed additives(A1, A2, A3) in the cortisol level (ng/ml) among chickens. Fifteen chickens were randomly assigned to the three feed additives. The cortisol level (ng/ml) of the chickens was then measured after four weeks. Suppose they conducted another set of experiment with increased sample size and saw that the three feed additives have different mean cortisol level. Table below showed summary of Tukey’s HSD. Summarize the result of Tukey’s HSD in Table 2 and provide synthesis.  Table 1. Matrix of HSD’s test result for the experiment Treatments    Mean difference    p-value A2-A1    -0.8960    0.00154 A3-A1    -0.9040    0.00129 A3-A2    -0.0080    0.99907 Table 2. Summary of HSD’s result Treatment    Mean    SD    Summary (in letter or in dot form) A1    2.572    0.2546959      A2    1.676    0.3041874      A3    1.668    0.3562583      Synthesis:

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CHICKEN FEED ADDITIVE STUDY
Instruction: For all test of hypotheses, write Ho and Ha in words, specify test 
procedure, show computed test statistic with df (if applicable), p-value, decision and conclusion.A study was conducted to determine the effect of different types of feed additives(A1, A2, A3) in the cortisol level (ng/ml) among chickens. Fifteen chickens were randomly assigned to the three feed additives. The cortisol level (ng/ml) of the chickens was then measured after four weeks.

Suppose they conducted another set of experiment with increased sample size and saw that the three feed additives have different mean cortisol level. Table below showed summary of Tukey’s HSD. Summarize the result of Tukey’s HSD in Table 2 and provide synthesis. 
Table 1. Matrix of HSD’s test result for the experiment

Treatments    Mean difference    p-value
A2-A1    -0.8960    0.00154
A3-A1    -0.9040    0.00129
A3-A2    -0.0080    0.99907
Table 2. Summary of HSD’s result


Treatment    Mean    SD    Summary (in letter or in dot form)
A1    2.572    0.2546959     
A2    1.676    0.3041874     
A3    1.668    0.3562583     
Synthesis:

1. CHICKEN FEED ADDITIVE STUDY
data: Al
W = 0.98999
p-value
Wilk-Shapiro Test for Normality
data: A2
W = 0.87485
p-value = 0.2866
data: A3
W = 0.97079
p-value
0.9797
0.8803
%3!
Bartlett test of homogeneity of variances
cortisol by additive
data:
Bartlett's K-squared = 0.39956, df = 2, p-value
0.8189
Analysis of Variance
Df Sum Sq Mean Sq F value
Pr(>F)
14.24 0.000678 ***
additive
2.700 1.3501
Residuals
1.137 0.0948
---
Signif. codes:
O * ***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 '
Kruskal-Wallis Rank Sum Test
cortisol by additive
9.42, df = 2, p-value
data:
Kruskal-Wallis chi-squared
= 0.009005
A22
Transcribed Image Text:1. CHICKEN FEED ADDITIVE STUDY data: Al W = 0.98999 p-value Wilk-Shapiro Test for Normality data: A2 W = 0.87485 p-value = 0.2866 data: A3 W = 0.97079 p-value 0.9797 0.8803 %3! Bartlett test of homogeneity of variances cortisol by additive data: Bartlett's K-squared = 0.39956, df = 2, p-value 0.8189 Analysis of Variance Df Sum Sq Mean Sq F value Pr(>F) 14.24 0.000678 *** additive 2.700 1.3501 Residuals 1.137 0.0948 --- Signif. codes: O * ***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' Kruskal-Wallis Rank Sum Test cortisol by additive 9.42, df = 2, p-value data: Kruskal-Wallis chi-squared = 0.009005 A22
Table 1. Matrix of HSD's test result for the experiment
Treatments Mean difference|p-value
A2-A1
|-0.8960
0.00154
A3-A1
|-0.9040
0.00129
A3-A2
|-0.0080
0.99907
Table 2. Summary of HSD's result
Treatment Mean SD
Summary (in letter or in dot form)
A1
2.572 0.2546959
A2
1.676 0.3041874
A3
1.668 0.3562583
Transcribed Image Text:Table 1. Matrix of HSD's test result for the experiment Treatments Mean difference|p-value A2-A1 |-0.8960 0.00154 A3-A1 |-0.9040 0.00129 A3-A2 |-0.0080 0.99907 Table 2. Summary of HSD's result Treatment Mean SD Summary (in letter or in dot form) A1 2.572 0.2546959 A2 1.676 0.3041874 A3 1.668 0.3562583
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