Term
| What are skewed distributions? Which way will the tail point in negatively and positively skewed distributions? |
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Definition
| Skewed distributions are those that contain tails and aren't symmetrical distributions. A negative skew would have a tail that points to the left a positive skew would have a tail that points to the right. |
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Term
| What is a bimodal distribution? |
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Definition
| A bimodal distribution is one that has two peaks with a valley in between. |
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Term
| How to calculate interquartile range and determining outliers from that |
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Definition
| Multiply n by 1/4 or 3/4 for 1st or 3rd quartiles respectively. If the number is a whole number, the quartile is the mean of the value at this position and the next highest position. If it is a decimal round up to the next whole number and take that as the quartile position. If a value falls more than 1.5 interquartile ranges outside the first or third quartiles it is considered an outlier. |
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Term
| What are the three typical causes of outliers? |
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Definition
1. A true statistical anomaly (ie 7ft tall person)
2. A measurement error
3. A distribution not approximated by the normal distribution such as a skewed distribution with a long tail. |
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Term
| independent vs. dependent events |
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Definition
| independent events have no effect on one another while dependent events impact one another such that the order changes the probability. |
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Term
| mutually exclusive outcomes |
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Definition
| can't occur at the same time |
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Term
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Definition
| when a group of outcomes includes all of the possible outcomes |
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Term
| How would you determine the probability of that only one of two independent events will occur? |
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Definition
| Add their independent probabilities together and subtract the product of their probabilities. |
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Term
| What do linear, parabolic, exponential and logarithmic graphs look like? |
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Definition
linear - a line
parabolic - a U
exponential -
logarithmic - |
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