作者apei (请牢记最初的梦想)
看板FJU-ACC95b
标题[统计] 第一次小考解答
时间Wed Nov 7 20:37:08 2007
I. (1) Quantitative; Interval
(2) Qualitative; Nominal
(3) Quantitative; Ratio
(4) Qualitative; Nominal
(5) Qualitative; Ordinal
II. (1) All brands of minisystems manufactured.
(2) 10 elements.
(3) Quantitative: Price, CD capacity, Tape decks.
Qualitative: Sound quality, FM tuning.
(4) 70%
(5) 40%
III.(1) Stem-and-leaf display
0 8 9
1 0 2 2 2 3 4 4 4
1 5 5 6 6 6 6 7 7 8 8 8 8 9 9 9
2 0 1 2 2 2 3 4 4 4
2 5 6 8
3 0 1 3
(2) (3) (4)
Number Answered Correctly Frequency Relative Frequency Cumulative Frequency
-----------------------------------------------------------------------------
5 - 9 2 0.050 2
10 - 14 8 0.200 10
15 - 19 15 0.375 25
20 - 24 9 0.225 34
25 - 29 3 0.075 37
30 - 34 3 0.075 40
Totals 40 1.000
※注:(2)Histogram(略)※
IV. (1) Winter:variance:8.233, standard deviation:2.8694,
coefficient of variation:16.21%
Summer: 44.4889, 6.67, 26.05%
(2)盒型图(略)
(3) More variability in the summer months.
V. (1) at least 75% of adults.
(2) The empirical rule is greater than Chebyshev’s theorem.
祝大家期中考顺利!!
-----------------------------------
期中考试
时间:11/12(一)16:30~18:30
教室:LM203
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✽关於第二次作业✽
"限"课本93页第19题(算标准差与变异数)
因为原先与甲班助教讨论之作业评分原则~
但因甲班助教忘记了...所以导致评分标准与本班不同~
所以我决定要帮大家加分~
如果此题有被扣分的同学烦请期中考"当天"缴交给我!
逾期不收喔~~~~~~~~~!!
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