警方學(xué)員坐在一個黑暗的房間里,對著投影屏幕。十個不同的許可飛機(jī)被投影在屏幕上,一次一個,每次5秒,兩次試驗間隔15秒。在最后15秒的時間間隔里,打開燈,要求警察學(xué)員以任意次序?qū)懴掠^察到的盡可能多的10個牌號。隨機(jī)抽取試驗中的15名學(xué)員參加了為期一周的記憶訓(xùn)練課程。然后,對他們進(jìn)行重新測試,正確號碼牌的數(shù)量結(jié)果如下表所示。
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One rule that must always be followed in constructing frequency distributions is that ().
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如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數(shù)為()
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A cumulative frequency distribution would provide().