Questions and answers for exam Preparation

MCQs

Total Questions : 61 | Page 3 of 7 pages

Question 21. In regression analysis, the variable that is being predicted is the

response, or dependent, variable
independent variable
intervening variable
is usually x

Discuss Question

Answer: Option A. -> response, or dependent, variable

Question 22. In least squares regression, which of the following is not a required assumption about the error
term ε?

The expected value of the error term is one
The variance of the error term is the same for all values of x.
The values of the error term are independent
The error term is normally distributed.

Discuss Question

Answer: Option A. -> The expected value of the error term is one

Question 23. Larger values of r^2 (R^2
) imply that the observations are more closely grouped about the

average value of the independent variables
average value of the independent variables
least squares line
origin

Discuss Question

Answer: Option C. -> least squares line

Question 24. In a regression analysis if r^2 = 1, then

SSE must also be equal to one
SSE must be equal to zero
SSE can be any positive value
SSE must be negative

Discuss Question

Answer: Option B. -> SSE must be equal to zero

Question 25. The coefficient of correlation

is the square of the coefficient of determination
is the square root of the coefficient of determination
is the same as r-square
can never be negative

Discuss Question

Answer: Option B. -> is the square root of the coefficient of determination

Question 26. In regression analysis, the variable that is used to explain the change in the outcome of an
experiment, or some natural process, is called

the x-variable
the independent variable
the predictor variable
the explanatory variable
all of the above

Discuss Question

Answer: Option E. -> all of the above

Question 27. In the case of an algebraic model for a straight line, if a value for the x variable is specified, then

the exact value of the response variable can be computed
the computed response to the independent value will always give a minimal residual
the computed value of y will always be the best estimate of the mean response
none of these alternatives is correct.

Discuss Question

Answer: Option A. -> the exact value of the response variable can be computed

Question 28. In a regression and correlation analysis if r
2 = 1, then