Normal Distribution Flashcards
1
Q
How do you represent normally distributed data?
A
2
Q
What are the characteristics of the normally distributed curve?
A
Symmetrical
Continuous
Mode= median= mean
Total area under curve = 1
3
Q
What percentage of the data is within 1 standard deviation, 2 and 3?
A
- 68%
- 95%
- 99.7%
4
Q
What is the formula for standardising X results ?
A
Where Z has a mean of zero and standard deviation of 1
5
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6
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7
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8
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9
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10
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11
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12
Q
What does the letter Z represent?
A
The number of standard deviations above the mean.
The variable is known as a standard normal distribution
13
Q
What is the formula for Z coding?
A
14
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15
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16
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17
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18
Q
What happens to the standard deviation and variance increasing by a scale factor 3?
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19
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20
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21
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22
Q
What’s the general method ?
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23
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24
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25
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