1. A regression analysis yields the following information: 0.0, 4.05 6.842, 9.49
ID: 3049226 • Letter: 1
Question
1. A regression analysis yields the following information:
0.0, 4.05
6.842, 9.497
4.15, 12.25
2.67, 5.33
2. A researcher is studying the relationship between 10 different variables and a critical measure of business performance. What method can be used to select the best set of variables to predict performance?
Stepwise regression
Residual analysis
Simple linear regression
ANOVA
3.
Consider a regression model involving more than one independent variable. The test used to determine if the relationship between the dependent variable and the set of independent variables is significant is the ________.
chi-square test
z-test
F-test
test
4. Consider the multiple regression model shown next between the dependent variable Y and three independent variables X1, X2, and X3, which result in the following function:
4.02
3.83
2.53
2.61
5. If a data set of 10 observations is used in a multiple regression analysis with 10 independent variables, then ________.
R2 will be equal to 1.0
The multiple standard error of the estimate will be 1.0
The independent variables will be correlated
The regression coefficients will all equal 1.0
6.
In regression, the difference between the confidence interval and prediction interval formulas is ________.
the prediction interval is the square root of the confidence interval
the prediction interval uses r2 and the confidence interval uses r
the addition of "1" to the quantity under the radical sign
no difference.
7.
The variance inflation factor can be used to reduce multicollinearity by ________.
Testing the null hypothesis that all regression coefficients equal zero
Decreasing homoscedasticity
Evaluating the distribution of residuals
Eliminating variables for a multiple regression model
7.
X = -12.8094 + 2.1794
= -12.80894 + 2.1794X
= 2.1794 - 12.8094X
12.8094 X = 2.1794
0.0, 4.05
6.842, 9.497
4.15, 12.25
2.67, 5.33
Explanation / Answer
sOLUTIONb:
2. A researcher is studying the relationship between 10 different variables and a critical measure of business performance. What method can be used to select the best set of variables to predict performance?
Stepwise regression is a method of fitting regression models in which a variable is considered for addition of subtraction form the ste of explanatory variables based on some specified criterion.
Stepwise regression
ANOVA
3.
Consider a regression model involving more than one independent variable. The test used to determine if the relationship between the dependent variable and the set of independent variables is significant is the ________.
ANOVA or F test
Is used to test model significance.
Solution6:
prediction interval has 1 and confidenc interval has 1/n
predction interval is
y^+/tSesqrt(1+1/n+(xg-xbar)^2/(n-1)Sx^2)
Confidence interval is
y^+/tSesqrt(1/n+(xg-xbar)^2/(n-1)Sx^2)
prediction interval is used to estimate the value of one value of y at given x
confidence interval used to estiamte the mean value of y(at given x)
ANSWER:
the addition of "1" to the quantity under the radical sign
the addition of "1" to the quantity under the radical sign
Stepwise regression
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.