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Statistics Homework Solutions 9

# Statistics Homework Solutions 9 - and because the original...

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SUPPLEMENTARY EXERCISES FOR CHAPTER 1 9 (b) True (c) False. If the result differs greatly from 5%, it is unlikely to be due to sampling variation. (d) True. If the result differs greatly from 5%, it is unlikely to be due to sampling variation. 5. (a) It is not possible to tell by how much the mean changes, because the sample size is not known. (b) If there are more than two numbers on the list, the median is unchanged. If there are only two numbers on the list, the median is changed, but we cannot tell by how much. (c) It is not possible to tell by how much the standard deviation changes, both because the sample size is unknown
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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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