用簡(jiǎn)單的隨機(jī)抽樣的方法選取樣本時(shí),采用了________辦法決定哪些個(gè)體進(jìn)入樣本.

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科目:初中數(shù)學(xué) 來(lái)源: 題型:044

某年級(jí)300名同學(xué)的體重如下(單位:kg):

49,

48,

43,

52,

62,

74,

43,

51,

46,

47,

51,

45,

50,

46,

52,

54,

50,

58,

55,

58,

48,

48,

53,

49,

56,

55,

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43,

54,

68,

47,

61,

51,

44,

41,

49,

53,

52,

49,

52,

62,

58,

52,

54,

50,

47,

66,

46,

47,

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72,

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49,

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52,

63,

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48,

49,

55,

53,

58,

50,

50,

43,

60,

61,

52,

50,

42,

44,

46,

67,

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66,

46,

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69,

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56,

55,

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51,

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49.

(1)請(qǐng)用計(jì)算器或計(jì)算機(jī)計(jì)算總體的平均數(shù)、方差和標(biāo)準(zhǔn)差(精確到0.01),并繪制總體的頻數(shù)分布直方圖;

(2)請(qǐng)用簡(jiǎn)單隨機(jī)抽樣方法,從上述調(diào)查的數(shù)據(jù)中分別抽取樣本容量為10的兩個(gè)樣本,并分別計(jì)算這兩個(gè)樣本的平均數(shù)、方差和標(biāo)準(zhǔn)差,分別繪制這兩個(gè)樣本的頻數(shù)分布直方圖,結(jié)果一致嗎?如果分別抽取樣本容量為20、50的兩個(gè)樣本呢?

(3)通過(guò)以上的抽樣和計(jì)算,你有什么發(fā)現(xiàn)?并與同伴交流.

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