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S38 - (iii The Chebyschev inequality says that least 1/9 of...

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16. In a perfectly symmetrical distribution a) the range equals the interquartile range. b) the interquartile range equals the mean. c) *the median equals the mean. d) the variance equals the standard deviation 17. Evaluate the following statements: (i) If every individual in the population is equally likely to be chosen to be in the sample, we must be taking a simple random sample. (ii) The sum of cumulative frequencies in a distribution always equals 1.
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Unformatted text preview: (iii) The Chebyschev inequality says that least 1/9 of the data must be 3 standard deviations or more from the mean. a) Only the first is true. b) Only the second is true. c) Only the third is true. d) *None are true. e) All are true. A simple random sample of n must also have all possible samples of n equally likely. The relative frequencies add to 1. At most 1/9 of the data is 3 or more standard deviations from the mean....
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