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Exam (elaborations)

BUAL 2650 exam 3 || with 100% Accurate Solutions.

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  • BUAL 2650
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  • BUAL 2650

hypotheses for hypothesis tests for slope correct answers H0: b1=b2=b3= 0 Ha: at least one b =/ 0 assumptions and conditions correct answers -linearity assumption -independence assumption -equal variance assumption -normal population assumption linearity assumption correct answers when th...

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  • November 2, 2024
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  • BUAL 2650
  • BUAL 2650
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BUAL 2650 exam 3 || with 100% Accurate Solutions.
hypotheses for hypothesis tests for slope correct answers H0: b1=b2=b3= 0
Ha: at least one b =/ 0

assumptions and conditions correct answers -linearity assumption
-independence assumption
-equal variance assumption
-normal population assumption

linearity assumption correct answers when the scatterplot is roughly straight

independence assumption
(randomization condition) correct answers the residual scatterplot had NO pattern

equal variance assumption
(equal spread condition) correct answers the residual plot spread is equal around the line y=0

normal population assumption correct answers the scatterplot has no outliers

how to preform a hypothesis test for slope correct answers look at the output (last table) for each
x-variable and decide to reject or fail to reject the x-variable (compare the p-value to the alpha
level)

standard error of the slope correct answers 2nd row, 2nd column, last table

standard error for the predicted value correct answers "standard error", first table

confidence interval correct answers b1 +- (t*n-2)(SE(b1))

b1 = x-var slope coefficient
t*n-2 = t table critical value (df=n-2)
SE(b1) = given in table

prediction interval correct answers y hat +- (t*n-2)(SE(y hat))

y hat = x bar plugged into the whole equation
t*n-2 = t table critical value (df=n-2)
SE(y hat) = given in table

interpretation of the regression equation correct answers slope (b1) is the change in y for every
one unit change in x

decision rules correct answers p-value < alpha level = REJECT
p-value > alpha level = FAIL TO REJECT

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