9 explain the difference between y ˆ y and y 10

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9. Explain the difference between y , ˆ y , and y . 10. Explain the difference between 2 y and 2 ˆ y . 11. Identify the letter used for correlation. 12. Which letters are most commonly used for random variables? 13. Explain the difference between the variables x and X. 14. Identify the letter that represents the number of observations in a sample. 15. Identify the letter used for the probability of an event.
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Statistics Notation a b n p q r s t x y z E F H P Notation is an important part of communication in mathematics. Using the correct notation for statistical concepts is essential. BE CAREFUL! In statistics, unlike algebra, you are NOT free to substitute another letter in place of standard notation. Each of the above letters has a specific meaning in statistics. Also remember that “hats” and “bars” change those meanings. For example, y , ˆ y , and y each have a very different meaning. Also, capitalizing a letter can change its meaning. First Semester Concepts: 1. Identify the letter used for the mean of a population. 2. Identify the letter used for the mean of a sample. x 3. Identify the letter used for the standard deviation of a population. 4. Identify the letter used for the standard deviation of a sample.
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