答案和详解如下： Q4. Which of the following is an example of a parameter? A) Sample standard deviation. B) Population variance. C) Sample mean. Correct answer is B) A parameter is any descriptive measure of a population characteristic. The population variance describes a population while the sample standard deviation and sample mean are each descriptive measures of samples. Q5. A summary measure of a characteristic of an entire population is called a:
A) statistic. B) parameter. C) census. Correct answer is B) A parameter measures a characteristic of the underlying population.
Q6. Which of the following statements regarding frequency distributions is least accurate? Frequency distributions: A) summarize data into a relatively small number of intervals. B) work with all types of measurement scales. C) organize data into overlapping groups. Correct answer is C) Data in a frequency distribution must belong to only one group or interval. Intervals are mutually exclusive and non-overlapping. | 
发表于 2008-12-31 16:34
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