15A-Practice+Test+2A - 10 Calculate Σ X Σ Y Calculate Σ...

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Practice Test 2A 1. What is the inner-quartile range for the following data? 27, 29, 29, 30, 24, 25, 27, 27, 4, 8, 17, 23. 2. Is it possible for a symmetric graph to be skewed? Please explain. 3. Draw a box-plot for the following data: 3, 4, 5, 7, 8, 8, 10, 12, 14, 18, 31, 40. 4. The expected value of a variable (or distribution) equals is simply the __________ of the variable (distribution). (The only acceptable answer is one word long.) 5. What is the area under a normal curve equal to? 6. No matter what the shape of a given distribution, what proportion has to be within three standard deviations of the mean? 7. Whit a normal curve, what proportion lies within three standard deviations of the mean? 8. Look at the below box-plot. Do you think the data is positively skewed or negatively skewed? 9. What is the symbol for the mean of a population?
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Unformatted text preview: 10. Calculate ( Σ X)( Σ Y). Calculate Σ XY. X=3, 2, 1. Y=6, 1, 3. 11. Draw a bimodal graph that is not symmetric. 12. Is it possible to have a graph that is not symmetric yet has no skew? 13. Estimate the inter-quartile range for the following distribution. 14. Amy took a test in her physics class. She got a 33. The mean was 22 with a standard deviation of four. Brain took a test in his biology class and he got a 630. The mean was 490 with a standard deviation of 80. Relatively speaking, who did better? 15. True or False: It is appropriate to call any unimodal, symmetric, bell-shaped distribution a normal curve. Please explain. 16. What must you do to the covariance in order to interpret it? 17. What does it mean if you calculate a value of 0 for Cramers V? 18. In order to find lambda, what do you use?...
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