推 panydan:1.d分層抽樣 3.a mse是樣本 4.d 具異常值用四分位距中位數 04/10 09:45
→ panydan:有錯請指教 04/10 09:45
1. The Dean of Students malled a survey to a total of 400 students.
The sample included 100 students randomly selected from each of the
freshman,sophomore,junior,and serior classes on campus last term.
What sampling method was used?
(a)systematic sample (b)simple random sample (c)cluster sample
(d)stratified sample
2. An airport has been criticized for the waiting times associated with
departing flights. While the critics acknowledge that man flights have
little or no waitting times, their complaints deal more specifically
with the longer waits attributed to some flights. The critics are
interested in showing, mathematically,exactly what the problems are.
Which type of distribution would best model the waiting times of the
departing flights at the Airport?
(a)uniform distribution (b)normal distribution (c)binomial distribution
(d)exponential distribution
3. The standard error of the mean
(a)measures the variability of the mean from sample to population.
(b)is never larger than the standard deviation of the population.
(c)decreases as the sample size increases.
(d)all of the above
4. When extreme values are present in a set of data, which of the following
descriptive summary measures are most approprlate?
(a)CV and range
(b)variance and interquartile range
(c)arithmetic mean and standard deviation
(d)interquartile range and median
希望題目沒打錯....
因為題目英文字很不清楚
希望幫我解答的人可以小小解釋一下為什麼會選擇那個答案^^
謝謝
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