# Statistics A Level

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 Author: yotomoco ID: 249225 Filename: Statistics A Level Updated: 2013-11-26 17:17:11 Tags: Statistics Level Folders: Description: srtyjk Show Answers:

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1. What is continuous data?
Data that can take any value in a given range
2. What is discrete data?
Data that can take only specific values in a given range
3. What is quantitative data?
Data associated with numerical observations
4. What is qualitative data?
Data associated with non-numerical observations
5. Equation to find the median of a set of data
• n
• 2
• if = whole number find the mid-point of the corresponding term and the term above
• if ≠ whole number round the number up and pick the corresponding term
6. Equation to find the mean of a set of data
• x = data
• n = number of observations
7. Equation to find the mean of data in a table
• f = frequency
• x = data or midpoint when grouped data
8. Equation for Q1
• n = number of observations
9. Equation for Q3
• n = number of observations
10. Equation for interquartile range
11. Equation to find the th percentile, P
• x = percentile
• n = number of observations
12. Equation for interpercentile range
• P = percentile
• m/n = number of the percentile
13. Equation for variance (using x_bar)
• x = data or midpoint when grouped data
• x_bar = mean
• n = number of observations
14. Equation for variance (using x and n only)
• x = data or midpoint when grouped data
• n = number of observations
15. Equation for standard deviation
16. Equation for lower bounds (outlier test)
• Q= lower quartile
• IQR = interquartile range
17. Equation for upper bounds (outlier test)
• Q= upper quartile
• IQR = interquartile range
18. Equation for frequency density
• f = frequency
• class width = difference between the lowest bound in the class and the highest
19. what type of distribution is this?

Symmetrical
20. What type of distribution is this?
positively skewed
21. What type of distribution is this?
negatively skewed
22. What type of distribution is this?
negatively skewed
23. What type of distribution is this?
positively skewed
24. What type of distribution is this?
symmetrical
25. Equation to work out how skewed the data is
• x_bar = mean
• SD = standard deviation
• the larger the number the larger the skew
• the closer the number to zero the more symmetrical the data
• a negative number means a negative skew
• a positive number means a positive skew
26. Define: experiment
a repeatable process that gives rise to a number of outcomes
27. Define: event
a collection (or set) of one or more outcomes
28. Define: sample space
the set of all possible outcomes of an experiment
29. On a Venn diagram:
A ∩ B
the overlap between event A and B
30. On a Venn diagram:
A ∪ B
the area contained within both A and B including the overlap
31. On a Venn diagram:
A '
Everywhere on the venn diagram apart from anywhere inside A

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