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p. 73. ISBN 978-1-351-66138-6. Freedman, David; Pisani, Robert; Purves, Roger (2007). Statistics (4 ed.). New York: Norton. ISBN 978-0-393-93043-6....15 KB (1,837 words) - 16:08, 10 June 2024- David; Pisani, Robert; Purves, Roger (February 20, 2007). Statistics: Fourth International Student Edition. W.W. Norton & Company. ISBN 9780393930436....6 KB (469 words) - 01:58, 5 February 2024
