答案和详解如下： Q1. How is the relative frequency of an interval computed? A) Dividing the frequency of that interval by the sum of all frequencies. B) Dividing the sum of the two interval limits by 2. C) Subtracting the lower limit of the interval by the upper limit. Correct answer is A) The relative frequency is the percentage of total observations falling within each interval. It is found by taking the frequency of the interval and dividing that number by the sum of all frequencies. Q2. Given the following frequency distribution: Return Frequency -10% up to 0% 5 0% up to 10% 7 10% up to 20% 9 20% up to 30% 6 30% up to 40% 3 What is the relative frequency of the 0% to 10% interval? A) 40.0%. B) 23.3%. C) 33.3%. Correct answer is B) Total number of frequencies = 30.
7/30 = 23.3%. Q3. Given the following frequency distribution: Return Frequency -10% up to 0% 5 0% up to 10% 7 10% up to 20% 9 20% up to 30% 6 30% up to 40% 3 What is the relative frequency of the 30% up to 40% return interval? A) 10.0%. B) 3.0%. C) 33.3%. Correct answer is A) Total number of frequencies = 30.
3/30 = 10.0% | 
发表于 2009-3-13 10:40
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