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提问人：网友waiwai001 发布时间：2022-01-07

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Let a random variable X1 be distributed as N（0,1). Now suppose that a second random variab

Let a random variable X1 be distributed as N(0,1). Now suppose that a second random variable, X2, is constructed as the product of X1 and an independent random variable Z, which equals 1 with probability 1/2 and -1 with probability 1/2. (1)What is the (marginal) distribution of X2？ (2)What is the covariance between X1 and X2？ (3)What is the distribution of X1 conditional on X2？

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更多“Let a random variable X1 be distributed as N（0,1). Now suppose that a second random variab”相关的问题

第1题

Genotypes AA, Aa, and aa occur with probabilities (π1,π2,π3). For n=3 independent observations, the observed frequencies are (n1,n2,n3). a. Explain how you can determine n3 from knowing n1 and n2. Thus, the multinomial distribution of (n1,n2,n3) is actually two-dimensional. b. Show the set of all possible observations, (n1,n2,n3) with n=3. c. Suppose (π1,π2,π3)=(0.25,0.50,0.25). Find the multinomial probability that (n1,n2,n3)=(1,2,0). d. Refer to (c).What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.

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第2题

2. When a word has more than one meaning, it is called monosemy.

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第3题

Suppose that the government imposes a business licence fee of $100 on all firms. Profit-maximizing firms that stay in business will respond to this tax by

A、raising prices to pay the tax

B、cutting output to reduce costs

C、lowering prices to stimulate sales

D、doing nothing

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第4题

Natural rubber is a kind of .

A、Thermoplastic polymers

B、Thermosetting polymers

C、Saturated polymers

D、Unsaturated polymers

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第5题

Suppose we know that a monopolist is maximizing its profits. Which of the following must be true? The monopolist has:

A、maximized its total revenue.

B、set price equal to its average cost.

C、maximized the difference between marginal revenue and marginal cost.

D、equated marginal revenue and marginal cost.

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第6题

For this part, you are allowed 30 minutes to write a letter. Suppose you are Wang Lin. Write a letter to your friend Liu Qiang. You should write at least 120 words according to the situation given below in Chinese:

假设你的好朋友刘强是大学四年级学生，正在考虑是考研究生继续深造，还是大学毕业后就踏上工作岗位。请给他写封信表明你的态度。

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第7题

A rise in the interest rate will generally result in people consuming less when they are old if the substitution effect outweighs the income effect.

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第8题

Suppose you have a cache with capacity of [图] byt...

Suppose you have a cache with capacity ofbytes, with 32-byte blocks. Assume the cache is two-way set associative. How many bits are used to select the set? (_______)

A、9 bits

B、8 bits

C、7 bits

D、None of the above.

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