#### Code in R ###
mental.csv
| Pre.test | Post.test | Treat |
| 72 | 74 | Control |
| 58 | 57 | Control |
| 66 | 74 | Control |
| 51 | 56 | Control |
| 30 | 28 | Control |
| 48 | 40 | Control |
| 58 | 61 | Control |
| 51 | 50 | Control |
| 38 | 40 | Control |
| 56 | 56 | Control |
| 68 | 72 | Control |
| 36 | 38 | Control |
| 53 | 53 | Control |
| 65 | 72 | Control |
| 32 | 24 | Control |
| 64 | 62 | Control |
| 58 | 55 | 025-050R |
| 58 | 57 | 025-050R |
| 56 | 57 | 025-050R |
| 73 | 59 | 025-050R |
| 49 | 42 | 025-050R |
| 53 | 49 | 025-050R |
| 28 | 29 | 025-050R |
| 31 | 43 | 025-050R |
| 23 | 29 | 025-050R |
| 61 | 62 | 025-050R |
| 40 | 37 | 025-050R |
| 57 | 59 | 025-050R |
| 38 | 48 | 025-050R |
| 77 | 79 | 025-050R |
| 69 | 64 | 025-050R |
| 72 | 67 | 025-050R |
| 50 | 46 | 025-050R |
| 49 | 49 | 025-050R |
| 51 | 46 | 025-050R |
| 23 | 16 | 075-125R |
| 60 | 51 | 075-125R |
| 54 | 43 | 075-125R |
| 48 | 40 | 075-125R |
| 45 | 35 | 075-125R |
| 37 | 31 | 075-125R |
| 50 | 48 | 075-125R |
| 44 | 31 | 075-125R |
| 39 | 31 | 075-125R |
| 57 | 46 | 075-125R |
| 26 | 14 | 075-125R |
| 50 | 54 | 075-125R |
| 47 | 41 | 075-125R |
| 43 | 30 | 075-125R |
| 41 | 30 | 075-125R |
| 45 | 44 | 075-125R |
| 68 | 69 | 075-125R |
| 62 | 35 | 075-125R |
| 64 | 51 | 125-250R |
| 42 | 26 | 125-250R |
| 52 | 35 | 125-250R |
| 47 | 27 | 125-250R |
| 53 | 40 | 125-250R |
| 65 | 50 | 125-250R |
| 67 | 46 | 125-250R |
| 32 | 25 | 125-250R |
| 77 | 58 | 125-250R |
| 32 | 24 | 125-250R |
| 58 | 45 | 125-250R |
| 46 | 32 | 125-250R |
| 45 | 30 | 125-250R |
| 74 | 68 | 125-250R |
| 41 | 17 | 125-250R |
| 46 | 29 | 125-250R |
| 39 | 20 | 125-250R |
| 61 | 38 | 125-250R |
| 50 | 33 | 125-250R |
| 29 | 12 | 125-250R |
| 72 | 54 | 125-250R |
| 38 | 23 | 125-250R |
Homework Answers
Analysis:
Ho: the mean values of decrease_dex in four treatment groups are
the same
h1: at least one of the mean values of decrease_dex in four
treatment groups are different
With F(3, 71) = 36.61, P<5%, I reject ho and conclude that at
least one of the mean values of decrease_dex in four treatment
groups are different.
from post hoc analysis, with p<5%, i reject ho and conclude that the mean values of decrease_dex differs significantly between (075-125R-025-050R), (125-250R-025-050R), (125-250R-075-125R), (Control-075-125R ), and (Control-125-250R).
Code:
library(readxl)
data1<-read_excel(path="C:/Users/HP/Desktop/Book2.xlsx")
summary(data1)
data1$decrease_sex <- c(data1$Pre.test-data1$Post.test)
results = aov(decrease_sex~ Treat, data=data1)
summary(results)
tukey.test <- TukeyHSD(results)
tukey.test
Output:
Add Answer to:
#### Code in R ###
mental.csv
Pre.test
Post.test
Treat
72
74
Control
58
57
Control
66...
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58
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68
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57
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75
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64
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