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【单选题】
How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: 【图片】= 52, s = 22. Suppose the test statistic does fall in the rejection region at【图片】 = 0.05. Which of the following conclusions is correct?A.
At = 0.05, there is not sufficient evidence to conclude that the average number of tissues used during a cold is 60 tissues.
B.
At = 0.05, there is sufficient evidence to conclude that the average number of tissues used during a cold is 60 tissues.
C.
At = 0.05, there is not sufficient evidence to conclude that the average number of tissues used during a cold is not 60 tissues.
D.
At = 0.10, there is sufficient evidence to conclude that the average number of tissues used during a cold is not 60 tissues.
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【简答题】（1）实验一中液体变红的是______（填字母）； （2）实验二中高分子薄膜做的鸟笼，实现了鱼鸟共嬉戏的和谐画面．推测图中薄膜具有的性质是______； （3）实验三的名称是______，燃烧匙中所盛药品为红磷，实验中红磷要过量，其原因是______． 实验步骤正确的排序是______（填序号）． ①用弹簧夹夹紧乳胶管； ②红磷熄灭并冷却后，打开弹簧夹，观察现象； ③在集气瓶中加入一定量的水； ④...
【多选题】拉丁字母的特征有（）
A.
拉丁字体起源为希腊文字
B.
拉丁字母笔画少，字形结构简单
C.
拉丁文字一共有24个字母
D.
字母之间字形的大小差距较大，在字母组合排列上稍有难度
E.
拉丁字母的基本结构由引线、字形、笔画、间距4个基本要素构成
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