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Unformatted text preview: and because the original standard deviation is unknown. 7. (a) The mean decreases by 0.774. (b) The value of the mean after the change is 25 774 24 226. (c) The median is unchanged. (d) It is not possible to tell by how much the standard deviation changes, because the original standard deviation is unknown. 9. Statement (i) is true. The sample is skewed to the right. 11. (a) Incorrect, the total area is greater than 1. (b) Correct. The total area is equal to 1. (c) Incorrect. The total area is less than 1....
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- Fall '11