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未经化学改性的精制豆油
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举一反三
【单选题】In the simple linear regression model, the population parameters of the y -intercept and the slope are estimated by:
A.
and
B.
and
C.
and
D.
and
【判断题】In developing a 95% confidence interval for the expected value of y from a simple linear regression problem involving a sample of size 10, the appropriate table value would be 1.86.
A.
正确
B.
错误
【单选题】A prediction equation for sales and payroll was performed using simple linear regression. In the regression printout shown below, which of the following statements is/are not true?
A.
Payroll is a good predictor of Sales based on α = 0.05.
B.
There is evidence of a positive linear relationship between Sales and Payroll based on α = 0.05.
C.
Payroll is not a good predictor of Sales based on α = 0.01.
D.
The coefficient of determination is equal to 0.833333.
E.
Payroll is the independent variable.
【单选题】In the simple linear regression model, the y -intercept represents the:
A.
change in y per unit change in x .
B.
change in x per unit change in y .
C.
value of y when x = 0.
D.
value of x when y = 0.
【判断题】In a simple linear regression problem, if the coefficient of determination is 0.95, this means that 95% of the variation in the independent variable x can be explained by the regression line.
A.
正确
B.
错误
【单选题】A prediction equation for starting salaries (in $1,000s) and SAT scores was performed using simple linear regression. In the regression printout shown below, what can be said about the level of signif...
A.
SAT is not a good predictor for starting salary.
B.
The significance level for the intercept indicates the model is not valid.
C.
The significance level for SAT indicates the slope is equal to zero.
D.
The significance level for SAT indicates the slope is not equal to zero.
E.
None of the above
【判断题】In order to estimate with 95% confidence a particular value of y for a given value of x in a simple linear regression problem, a random sample of 20 observations is taken. The appropriate table value ...
A.
正确
B.
错误
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