In: Statistics and Probability
Table 2: Number of items Suspended | |||||
Rocks | Kittens | Daggers | Wookies | ||
Luke | 25 | 15 | 30 | 3 | |
Rey | 30 | 5 | 45 | 2 | |
Anikin | 25 | 25 | 40 | 5 |
Examine the data in Table 2. It shows the number of different types of objects that each | |||||||
Jedi trainee can suspend in the air after 12 weeks of training. | |||||||
Do an ANOVA analysis - Randomized Block Design at alpha = 0.05. | |||||||
Put the output in the indicated area. | |||||||
Is there a difference in the 3 kids overall ability to suspend objects in the air (rows)? | |||||||
Is there a difference in the type of object that is suspend objects in the air (columns)? | |||||||
Put the p-factor and coclusion in the indicated space. | |||||||
Based upon the data in Table 2, perform a Chi-square Test Of Independence to determine | |||||||
if the type of suspended objects is dependent upon the Jedi trainee doing the suspending. |
Anova: Two-Factor Without Replication | ||||||
SUMMARY | Count | Sum | Average | Variance | ||
Luke | 4 | 73 | 18.25 | 142.25 | ||
Rey | 4 | 82 | 20.5 | 424.3333 | ||
Anikin | 4 | 95 | 23.75 | 206.25 | ||
Rocks | 3 | 80 | 26.66667 | 8.333333 | ||
Kittens | 3 | 45 | 15 | 100 | ||
Daggers | 3 | 115 | 38.33333 | 58.33333 | ||
Wookies | 3 | 10 | 3.333333 | 2.333333 | ||
ANOVA | ||||||
Source of Variation | SS | df | MS | F | P-value | F crit |
Rows | 61.16667 | 2 | 30.58333 | 0.662854 | 0.549421 | 5.143253 |
Columns | 2041.667 | 3 | 680.5556 | 14.75015 | 0.003553 | 4.757063 |
Error | 276.8333 | 6 | 46.13889 | |||
Total | 2379.667 | 11 |
p value for rows : 0.5494
p value > 0.05, do not reject Ho
so, there is not a difference in the 3 kids overall ability to suspend objects in the air (rows)
.................
p value for column: 0.0035
p value<0.05, reject Ho
so, there is a difference in the type of object that is suspend objects in the air (columns)
..........................
Chi-Square Test of independence | |||||||
Observed Frequencies | |||||||
0 | |||||||
0 | Rocks | Kittens | Daggers | Wookies | Total | ||
Luke | 25 | 15 | 30 | 3 | 73 | ||
Rey | 30 | 5 | 45 | 2 | 82 | ||
Anikin | 25 | 25 | 40 | 5 | 95 | ||
Total | 80 | 45 | 115 | 10 | 250 | ||
Expected frequency of a cell = sum of row*sum of column / total sum | |||||||
Expected Frequencies | |||||||
Rocks | Kittens | Daggers | Wookies | Total | |||
Luke | 80*73/250=23.36 | 45*73/250=13.14 | 115*73/250=33.58 | 10*73/250=2.92 | 73 | ||
Rey | 80*82/250=26.24 | 45*82/250=14.76 | 115*82/250=37.72 | 10*82/250=3.28 | 82 | ||
Anikin | 80*95/250=30.4 | 45*95/250=17.1 | 115*95/250=43.7 | 10*95/250=3.8 | 95 | ||
Total | 80 | 45 | 115 | 10 | 250 | ||
(fo-fe)^2/fe | |||||||
Luke | 0.115 | 0.263 | 0.382 | 0.002 | |||
Rey | 0.539 | 6.454 | 1.405 | 0.500 | |||
Anikin | 0.9592 | 3.6497 | 0.3133 | 0.3789 |
Chi-Square Test Statistic,χ² = Σ(fo-fe)^2/fe
= 14.961
Level of Significance = 0.05
Number of Rows = 3
Number of Columns = 4
Degrees of Freedom=(#row - 1)(#column -1) = (3- 1 ) * ( 4- 1 )
= 6
p-Value = 0.0206 [Excel function:
=CHISQ.DIST.RT(χ²,df) ]
Decision: p-value < α , Reject
Ho
type of suspended objects is dependent upon the Jedi
trainee doing the suspending.
.........................
Please revert back in case of any doubt.
Please upvote. Thanks in advance.