the following table shows the weight of 30 students in a class.
class no.....01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
weight(Kg) 45 50 47 55 61 57 44 57 70 61 78 49 60 59 65 56 43 45 66 37
class no ....21 22 23 24 25 26 27 28 29 30
weight(Kg) 51 64 58 64 60 61 52 44 49 62
(a) if the 5th student of every 5 students is selected, identify the sampling method
used.
(b) what is the sample size of the survey?
(c)Find the sample mean.
一條簡單數學 急用15分多謝
2015-03-30 5:23 am
回答 (1)
2015-03-30 5:55 am
✔ 最佳答案
(a)Systematic sampling.
(b)
Sample size = 30/5 = 6.
(c)
Class No Weight (kg)
5 61
10 61
15 65
20 37
25 60
30 62
Sample mean
= (61 + 61 + 65 + 37 + 60 + 62)/6
= 57.66666667 (kg)
收錄日期: 2021-04-15 18:55:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150329000051KK00097