题目内容
（请给出正确答案）
A．They are in the frame. of mind to buy anything.
B．They are looking for something they need.
C．They feel lost because there are so many advertisements.
D．They feel the same as when they look at display advertisements.
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（由简答题聘请的专业题库老师提供的解答）
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Given the following information, calculate
, the pooled sample variance that should be used in the pooled-variance t test.
n1 = 16, n2 = 25.
A、
B、
C、
D、
A、change of the shape of the lens
B、convergence of the eye balls.
C、refraction by the cornea.
D、pupillary reflex
A、unlawful,agree
B、unlawful,refuse
C、lawful,agree
D、lawful,refuse
B.Means of livelihood.
C.An interesting class.
D.A series of postures.
A、It is a socially or ritually recognized union or legal contract between spouses that establishes rights and obligations between them, between them and their children, and between them and their in-laws.
B、It varies according to different cultures, but it is principally an institution in which interpersonal relationships, usually sexual, are acknowledged.
C、It is a variety of different feelings, states, and attitudes that ranges from interpersonal affection to pleasure. It can refer to an emotion of a strong attraction and personal attachment.
D、In some cultures, it is recommended or considered to be compulsory before pursuing any sexual activity. When defined broadly, it is considered a cultural universal.
A、the odds
B、the odd
C、the possibility
D、the opportunities
Let
be an i.i.d. random sample from
. Assume that
is known. We want to test
VS
. Denote
, where
is the MLE. What is the exact distribution of
?
A、N (0,1)
B、
C、
D、The limiting distribution of
as
.
, under regularity conditions, the asymptotic distributions of the Wald test statistic and the likelihood ratio test statistic are identical.
The likelihood ratio under
and
is always between 0 and 1.
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