現有一包含49 戶台北市家庭每月飲食支出的隨機樣本,其樣本平均數為
12,800 元,樣本標準差為3,500 元。如果台北市家庭每月飲食支出為常態
分配,請問在95%信賴係數下,平均數的信賴區間為何?如果我們不能確
定飲食是否為常態分配,請問在95%信賴係數下,平均數大致的信賴區間
為何?(10%)
參加校慶活動的學生中,大一、大二、大三、大四的學生各佔四分之一,
其中大一學生中的百分之四十,大二學生中的百分之三十,大三學生中的
百分之三十,大四學生中的百分之二十為女生。如今隨機抽出一名學生參
加校長聚會。如果抽出的為女學生,則其為大一學生的機率為何?如果抽
出的為男學生,則其為大三學生的機率為何?(10%)
The sample size is insufficient to draw a conclusion with 95% confidence.
The null hypothesis should not be rejected at the 5% level.
Because George and Mary have a different population of friends, their
sampling procedure makes it difficult to compare the recipes.
Because George and Mary each used only their own respective methods,
their cooking ability is confounded with the recipe quality.
Because George and Mary each used only the ovens in their houses, the
method quality is confounded with the characteristics of the oven.
Because George and Mary used the same questionnaire, their results
will generalize to the combined population of their friends.
Because George and Mary each baked one batch, there is no replication
of the cookie methods.
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