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31 Cards in this Set
- Front
- Back
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What are the two main types of Data? |
•Quantitative •Qualitative |
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What are the Levels of Measurement? |
•Nominal level •Ordinal level •Interval level •Ratio level |
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Is Qualitative Data numeric or non-numeric? |
Can be either |
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Is Quantitative Data Numeric or Non-numeric? |
Can only be Numeric |
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What is Nominal Data? |
Qualitative No fixed order Just used to distinguish one thing from another |
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What is Ordinal Data? |
Qualitative Same as Nominal Data, but with the ability to rank/order values |
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What is Ratio Data? |
Quantitative Speed, weight, height, currency, temperature |
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What is Interval Data? |
Quantitative Nothing exists at zero At a stop sign, your speed should be zero |
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What is Descriptive Statistics? |
Displaying information you've collected |
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What is Inferential Statistics? |
The process of estimating what's happening in the population based on the sample |
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What is Frequency Distribution? |
Amount within each category |
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What is the difference between a Histogram and a Bar Graph? |
On a Histogram, the bars are touching |
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What are the Two types of Mean? |
Population Mean Sample Mean |
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What is the Mode? |
The most frequent number(s) in the set |
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What is Range? |
Range = Highest Value in set - Lowest Value in set |
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If the Median is larger than the Mean, how is distribution skewed? |
Distribution is left-skewed |
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If the Mean is larger than the Median, how is distribution skewed? |
Distribution is right-skewed |
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How do you do Measures of Location? |
If you arrange in ascending order, what is the shape of the distribution. |
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How do you calculate Percentile? |
1. Arrange numbers in ascending order 2. Find index i 3. If "i" is whole number, take the average of "i"th and (i+1)th. Otherwise, round up. |
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What is the Five # Summary? |
Put into ascending order. 1. Find the minimum #. (First number in the set) 2. 25th percentile (Q1). i=(25/100)(n) 3. Median-> 50th percentile (Q2). i=(50/100)(n) 4. 75th percentile (Q3). i=(75/100)(n) 5. Maximum # in the set. (Last number in the set) |
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How do you calculate Inter Quartile Range (IQR)? |
=Q3 - Q1 |
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How do you calculate Lower Limit? |
=Q1 - (1.5)(IQR) |
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How do you calculate Upper Limit? |
=Q3 + (1.5)(IQR) |
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Probablity |
0 - Will not happen 1 - Will happen |
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What is an Event? |
One or More of Outcomes of an experiment |
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What is a Simple Event? |
Only One Outcome is possible |
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What is Classical Probability? |
Am equal chance for all outcomes. (Flipping a coin or rolling a die) |
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What is Empirical Probability? |
The use of historical data to determine chances |
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What is Subjective Probability? |
Opinion based by "experts," varies from person to person. |
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Rules of Probability (1) |
0 -> 1, cannot be less than 0, cannot be greater than 1. |
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Rules of Probability (2) |
Sum of probability of all outcomes must Equal 1. |
