2、In order to test for the significance of a regression model involving 14 independent variables and 255 observations, the numerator and denominator degrees of freedom (respectively) for the critical value of F are

A.14 and 255

B.255 and 14

C.14 and 240

D.13 and 240

正确答案：14 and 240

3、In a multiple regression analysis model involving 2 independent variables and 15 observations, SSR = 268 and SST = 325. The adjusted coefficient of determination is

A.0.90

B.0.80

C.0.70

D.Not enough information is provided to answer this question

正确答案：0.80

4、Which is considered to be a positive linear relationship

A.x goes up, y goes down

B.x goes down, y goes up

C.x goes down, y goes down

D.x goes up, y goes up

E.both c and d

正确答案：both c and d

5、In a regression analysis, if SSE is hypothetically decreased, then

A.R2 will Decrease

B.Se will Increase

C.SST will decrease

D.Both a and b

E.None of the above

正确答案：None of the above

1、deviation is the distance between a ___ and the ____.v

A.median, mean

B.data point, mean

C. quartile, median

D.data point, median

正确答案：data point, mean

2、The sum of the deviations may be 0.00. To get around this problem, we use the __ of the deviations

A. square

B.absolute value

C.minimum

D. maximum

正确答案： square

3、The reason that we prefer the sample standard deviation as our measure of typical variation instead of the sample variance is that _

A. the variance is not as accurate a measurement as the standard deviation

B.the standard deviation has been corrected for bias while the variance has not

C.the standard deviation is in the same units as the data values.

D.the variance is in the same units as the data values.

正确答案：the standard deviation is in the same units as the data values.

4、The empirical rule tells us that approximately of the values cluster within a distance of 1 standard deviation from the mean for a bell-shaped distribution

A.68%

B.95%

C.99.7%

D.none of the above

正确答案：68%

5、X is a discrete random variable that can have values from 0 to infinity, and occurrences of the events X counts are independent. The standard deviation of X is equal to the square root of the mean. The probability distribution of X is a(n) _____distribution.

A. binomial