標題:
一條簡單數學 急用15分多謝
發問:
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 20weight(Kg) 45 50 47 55 61 57 44 57 70 61 78 49 60 59 65 56 43 45 66 37class no ....21 22 23 24 25 26 27 28 29 30weight(Kg) 51 64 58 64 60 61 52 44 49 62(a) if the... 顯示更多 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.
此文章來自奇摩知識+如有不便請留言告知
最佳解答:
(a) Systematic sampling. (b) Sample size = 30/5 = 6. (c) Class NoWeight (kg) 5 61 1061 1565 2037 2560 3062 Sample mean = (61 + 61 + 65 + 37 + 60 + 62)/6 = 57.66666667 (kg)
其他解答:
留言列表
