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Home Assignment
Using the same data file of the previous home assignment.
Discuss normality of the variable: mean anatomy score (of first and second year), your answer should include comment on the 4 topics we used to evaluate normality.
Submit your answer as a comment in this post below.
24 comments:
write ur answer here (do not forget ur name)
Name: Mohammed Yasser
1- Mean and Median:
* Mean = 80.3
* Median = 82.2
* They are almost near from each other.
2- Histogram:
http://i.imgur.com/YcifB1K.png
3- Kurtosis and Skewness:
* There is Negative Skew (to the left) = -1.2
* And there is positive kurtosis = +0.43
4- Q-Q Plot:
* It shows that the variant is away from normal distribution within the range ( -6 & +4 )
http://i.imgur.com/g4DmxPV.jpg
Name : Sarah Mohammed Antar
1- mean and median are close (mean = 80.36 , median = 82.25)
2- histogram nearly has a normal distribution, slightly skewed to the left
3- skewness : -1.24,
kurtosis : 0.463
4- Q-Q plot shows that the observed values are away from the expected values by a scale of 7.27
1- Mean and Median :
Mean = 80.34
Median = 82.25
SD = 7.28
median is far from mean .
2 - skewness and kurtosis :
Skewness = - 1.233
kurtosis = 0.430
Not bad
3 - Normal distribution curve :
there is skewness to the left .
4 - Q_Q plot :
Observed value are away from the expected Value .
*-Mean = 80.34
-Median = 82.25
-near to each other
*histogram:nearly normal distribution&slightly skewed to left.
*-skewed:to left(-1.24)
-kurtosis: to right(.463)
*Q-Qplot:away from the expected value.
*name: ahmed esmail
*-Mean = 80.34
-Median = 82.25
-near to each other
*histogram:nearly normal distribution&slightly skewed to left.
*-skewed:to left(-1.24)
-kurtosis: to right(.463)
*Q-Qplot:away from the expected value.
Name : Ali Mowafy
1- (mean = 80.36 , median = 82.25) close values
2- histogram shows A normal distribution Curve with a slight skewness to the left
3- skewness : -1.24,
kurtosis : 0.463
both are good values
4- Q-Q plot : shows that observed values are away from the expected values
Name: Hazem Kasem Khaled
1- Mean and Median:
* Mean = 80.3611
* Median = 82.2500
* They are near to each other .
2- Histogram:
Normal distribution curve with slight Skewness to the left
3- Kurtosis and Skewness:
* There is Negative Skew (to the left) = -1.244
* And there is positive kurtosis = +0.463
4- Q-Q Plot:
* It shows that the observed values are away from the expected values within the range ( -6 & +4 )
Name: Amr Shokry
1-Histogram is in normal distribution bell shaped but with a slight negative skewness
2-Mean and Median
Mean= 80.34
Median= 82.25
so i think they are near each other
3- Skewness and kurtosis
negative skew= 1.233
kurtosis= 0.430
they are witihn acceptable range so the data seems valid :)
4-Q-Q plot
shows many variations from the expected value ... only one point that is nearly around it
1-mean and median
*mean = 80.36
*median= 82.25
they are close to each other
2-skewness and kurtosis
*skewness = -1.24
*kurtosis = 0.46
lies between +2 & _2 so it is accepted to be normal
3-Histogram
normal distribution curve with slight skewness to the left
4-Q-Q Plot
observed values are away from the expected values
Name ; Arwa
mean :80.4
median:82.2
skewness: -1.2
kurtosis: .5
histogram show normal distribution curve with slight skewness to left
DATA SHOW NORMAL VARIATION
Name: Mona Farid Hosh
Mean:80,36
Median: 82,25
Skewness:-1.24
Kurtosis:.46
Histogram shows normal distribution curve with slight skew to the left
Q_Q Plot shows wide variation from expected value
Ahmed Elsaeed Sobhy
*Mean = 80.34
*Median = 82.25
**Mean and Median are close to each other
*Skewness = -1.23
*Kurtosis = 0.43
*Histogram : slight shift to left
*Q-Q plot : away from the expected Value .
Alyaa Ghoneem
Mean 80.3428
Median 82.2500
Skewness -1.233
Kurtosis .430
histograme show normal distribution curve with slight shift to lift ( -ve skewness )
Q-Q plot : values away from expected value
Mohamed Elmowafi
*Mean = 80.34
*Median = 82.25
**Mean and Median are almost near to each other
*Skewness = -1.23
*Kurtosis = 0.43
Histograme show normal data distribution curve with slight skew to left ( -ve skewness )and slight kurtosis
*Q-Q plot : away from the expected normal Value
Name: Essam
Mean : 82.36
Median: 82.25
Skewness :-1.22
Kurtosis : .463
Histogram : Skewed to the Left
Q-Q plot : ( Don't know how to comment on the Plot by wards ) ..
1-Mean is 80.34
Median is 82.25
SD is 7.28
(Not Close To each other)
2-Skewness -1.233
Kurtosis .430
skewness not bad
Kurtosis nearly normal
so Both may Be accepted
3-Histogram
Shows some sort of skewness to the left
4-Q-Q plot
Data away from expected normal curve
According to all these 4 Items I think the variable not distributed normally.
reem mohsen
Mean:76.1142
Median 81.5000
Skewness -3.512
Kurtosis 13.629
Q&Q show it is abnormal
انا مش عارفة ليه النتيجة بتاعتى مختلفة عن كل الناس !!!!
hint: check for missing data
"Determining normality of distribution of mean anatomy score for participants in MSRG (n=18)"
1- Histogram shape: sort of similarity to normal distribution curve
2- Mean and median:
Mean: 80.3428
Median:82.2500
difference= 1.9072
SD= 7.28170
difference/SD= 26.2% (significant distance between median and mean)
3- Skewness & Kurtosis:
-Negative Skewness: -1.233 (not bad)
-positive kurtosis: 0.430 (nearly normal)
4- QQ-plot:
observed values are scattered around normal values with majority of data deviating from normal by 0 to ±4
--Ahmed R. Maaty
name : Kareem Hosam El-Din
1- mean is 80.3 and median is 82.2 I think they are slightly not approximated to each other because Standard deviation is just 7.2
2- skewness is - 1.24 some negative skew but it`s not bad
kurtosis is 0.46 little +ve kurtosis nearly normal
3- Histogram from my point of view is not similar to normal distribution histogram
4-Q-Q plot 1st figure show that values don`t take the normal line of normal distribution
2nd figure shows that a lot of values are far from what expected
m.fllal
1.mean80.36..$median 82.2
not close to each other as
SD 7.2
2.skewness -1.24 &kurtosis 0.43
not bad
3.histogram..some skewness to right
4.qq blot..many values far from expected
name:Gehad Tawfik
1.mean:80.36 & median :82.2
not close to each other
2.skewness:-1.244 & kurtosis:.463
3.histogram skews slitly to right
4.QQ blot nearly normal
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