Question 1

How would you write the following expression using summation notation?
Q1 + Q2 + Q3 + Q4 + …………..+ Q29

Accepted Answer

Question 2

Which of the following statements is true of the standard normal distribution,but not other normal probability distributions?

Accepted Answer

A) P(Xx-1))= P(X>($\mu$x+1)) 
D) it is often referred to as a "bell" curve 
A) P(Xx-1))= P(X>($\mu$x+1)) 
D) it is often referred to as a "bell" curve A

Question 3

)The difference between a pdf and cdf is ___________________________.

Accepted Answer

A pdf shows the probability of a random variable having a specific value or falling into an interval and a cdf shows the probability a random variable will be any value less than or equal to the specific value.

Question 4

Which of the following is NOT equal to cov(X,Y)?

Accepted Answer

A) $\mu$xy 
B) E[(x-$\mu$x)(y-$\mu$y)] 
C) E(xy)-$\mu$x$\mu$y 
D) $\rho$xy 
A) $\mu$xy 
B) E[(x-$\mu$x)(y-$\mu$y)] 
C) E(xy)-$\mu$x$\mu$y 
D) $\rho$xy

Question 5

A measure of the daily change in the closing value of the DJIA is a ____________ variable and a variable indicating whether it moved up or down is a ______________ variable.

Accepted Answer

A) continuous,discrete 
B) flow,stock 
C) random,determined 
D) discrete,continuous 
A) continuous,discrete 
B) flow,stock 
C) random,determined 
D) discrete,continuous

Question 6

If (P(X=x|Y=y)= P(X=x),then

Accepted Answer

A) Y is the dependent variable 
B) X and Y are positively correlated 
C) X and Y are statistically independent 
D) Y must be a discrete random variable 
A) Y is the dependent variable 
B) X and Y are positively correlated 
C) X and Y are statistically independent 
D) Y must be a discrete random variable

Question 7

If Z is a random variable generated by adding together X and Y which are also random variables,what do we know about var(Z)if X and Y are positively correlated.?

Accepted Answer

A) var(Z)= var(X)+ var(Y) 
B) var(Z) var(X)+ var(Y) 
D) var(Z)= var(X)* var(Y) 
A) var(Z)= var(X)+ var(Y) 
B) var(Z) var(X)+ var(Y) 
D) var(Z)= var(X)* var(Y)

Question 8

Which of the following statements about the standard normal distribution is NOT true?

Accepted Answer

A) $\mu$=0 ,$\sigma$2 = 1 
B) it can be used to find probability intervals for any normal distribution 
C) it is symmetric 
D) it is derived from repeated sampling of naturally occurring phenomena 
A) $\mu$=0 ,$\sigma$2 = 1 
B) it can be used to find probability intervals for any normal distribution 
C) it is symmetric 
D) it is derived from repeated sampling of naturally occurring phenomena

Question 9

The expected value of a random variable is

Accepted Answer

A) the probability weighted mean 
B) a measure of central tendency of the pdf 
C) average value that occurs in many repeated trial of an experiment 
D) all of the above 
A) the probability weighted mean 
B) a measure of central tendency of the pdf 
C) average value that occurs in many repeated trial of an experiment 
D) all of the above

How would you write the following expression using summation notation? Q₁ + Q₂ + Q₃ + Q₄ + …………..+ Q₂₉

Which of the following statements is true of the standard normal distribution,but not other normal probability distributions?

)The difference between a pdf and cdf is ___________________________.

Which of the following is NOT equal to cov(X,Y)?

A measure of the daily change in the closing value of the DJIA is a variable and a variable indicating whether it moved up or down is a __ variable.

If (P(X=x|Y=y)= P(X=x),then

If Z is a random variable generated by adding together X and Y which are also random variables,what do we know about var(Z)if X and Y are positively correlated.?

Which of the following statements about the standard normal distribution is NOT true?

The expected value of a random variable is

An Introduction to Econometrics

The Simple Linear Regression Model

Interval Estimation and Hypothesis Testing

Prediction, Goodness-Of-Fit and Modeling Issues

The Multiple Regression Model

Further Inference in the Multiple Regression Model

Using Indicator Variables

Heteroskedasticity

Regression With Time Series Data: Stationary Variables

Random Regressors and Moment Based Estimation

Simultaneous Equations Models

Regression With Time Series Data: Nonstationary Variables

Vector Error Correction and Vector Autoregressive Models

Time-Varying Volatility and Arch Models

Panel Data Models

Qualitative and Limited Dependent Variable Models

Filters

Exam 2: Pp : Prob, Probability Primer, Probability Primer

How would you write the following expression using summation notation? Q1 + Q2 + Q3 + Q4 + …………..+ Q29

Which of the following statements is true of the standard normal distribution,but not other normal probability distributions?

)The difference between a pdf and cdf is ___________________________.

Which of the following is NOT equal to cov(X,Y)?

A measure of the daily change in the closing value of the DJIA is a ____________ variable and a variable indicating whether it moved up or down is a ______________ variable.

If (P(X=x|Y=y)= P(X=x),then

If Z is a random variable generated by adding together X and Y which are also random variables,what do we know about var(Z)if X and Y are positively correlated.?

Which of the following statements about the standard normal distribution is NOT true?

The expected value of a random variable is

An Introduction to Econometrics

The Simple Linear Regression Model

Interval Estimation and Hypothesis Testing

Prediction, Goodness-Of-Fit and Modeling Issues

The Multiple Regression Model

Further Inference in the Multiple Regression Model

Using Indicator Variables

Heteroskedasticity

Regression With Time Series Data: Stationary Variables

Random Regressors and Moment Based Estimation

Simultaneous Equations Models

Regression With Time Series Data: Nonstationary Variables

Vector Error Correction and Vector Autoregressive Models

Time-Varying Volatility and Arch Models

Panel Data Models

Qualitative and Limited Dependent Variable Models

Filters

How would you write the following expression using summation notation? Q₁ + Q₂ + Q₃ + Q₄ + …………..+ Q₂₉

A measure of the daily change in the closing value of the DJIA is a variable and a variable indicating whether it moved up or down is a __ variable.