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30 Cards in this Set
- Front
- Back
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What are the 2 types of data? |
Quantitative or qualitative |
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What is qualitative data? |
Non- numerical data |
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What is quantitative data? |
Numerical data |
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What are the 2 types of quantitative data? |
Discrete and continuous |
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What is discrete data? |
Data that can only take given values and is counted |
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What is continuous data? |
Data that can take any value on a scale, it is measured |
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What are the measures of location? |
Mean, median and mode |
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What is the mean? |
The sum of all the data divided by the number of pieces of data |
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What is the median? |
The middle piece of the ordered data |
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What is the mode? |
The value which occurs most often (highest frequency) |
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How do you find the mode in a list of data? |
Find the one which occurs most often |
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What if every number occurs only once? |
You say there's no mode |
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What is a disadvantage of using the mode? |
It can be more than one number |
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How is the median sometimes written? |
Q2 |
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How do you work out Q2 in a list? |
Use the formula (n+1)/2 and then find the number at this position in the list |
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What do you do if the value is x.5? |
Find the 2 numbers it lies between and find the midpoint for these numbers |
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What can the mean be written as? |
x̅ or μ
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What does μ denote? |
The mean of a population |
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What does x̅ denote? |
The mean of a set of data |
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What is the formula for the mean in words? |
Sum of all the data/ number of pieces of data |
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What can this be shortened to? |
Ʃx/n
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How do you find the mode in a frequency table? |
The mode is the number with the highest frequency |
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How do you find the median in a frequency table? |
(n+1)/2 the value. Then find which group this lies in by using a cumulative frequency column. |
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What's the equation to find the mean in a frequency table? |
Ʃfx/Ʃf |
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What does f stand for? |
Frequency |
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What does x stand for? |
The value |
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How do you find the mode in grouped data? |
This is the modal class |
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How do you find the mean of grouped data? |
Use the midpoints of each group and then follow the table method |
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How do you find the median of grouped data? |
Use interpolation |
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What's the equation for interpolation? |
Start value + (width x ((median value-cf of previous interval)/frequency of interval) |
