cortisol_level” of excel file “exer3_data.xlsx”. R outputs can be found in the file “exer3_outputs.pdf” 4. 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
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.
The data can be found in the worksheet “cortisol_level” of excel file
“exer3_data.xlsx”. R outputs can be found in the file “exer3_outputs.pdf”
4. Suppose they conducted another set of experiment with increased sample size and saw that the three feed additives have different
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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