Question

18) The ratio of the regression coefficient to its standard error is called:

A) t-statistic.

B) F-statistic.

C) partial F-statistic.

D) coefficient of determination.

Answer:

19) The range of values in which we can be confident that the true regression coefficient lies within a given degree of probability is called a:

A) prediction interval.

B) confidence interval.

C) logistic regression.

D) none of the above.

Answer:

20) The estimated regression equation is Y = 10 + 2.5X, if X =0 than the predicted value of Y is equal to:

A) 12.5

B) 10

C) 2.5

D) 7.5

Answer:

Answer 1

The ratio of the regression coefficient to its standard error is called t- statistics . As from the formulae for calculating t value we can directly find that it is the ratio of regression coefficient mean1- mean2 to standard error.

In next question to obtain a prediction interval we first plough the regression equation and then predict the range.

To calculate the value of Y from the regression equation we need to substitute the value of x=0 in the regression equation.