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Author Question: Second-order polynomial models: A) always curve upward. B) always curve downward. C) can curve ... (Read 116 times)

cherise1989

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on: Jun 24, 2018
Second-order polynomial models:
 
  A) always curve upward.
  B) always curve downward.
  C) can curve upward or downward depending on the data.
  D) measure interaction between variables.

Question 2

Which of the following statements is true?
 
  A) If the confidence interval estimate for the regression slope coefficient crosses over zero, the average change in y for a one-unit change in x may be zero.
  B) If the regression slope coefficient is very close to zero, this means that the relationship between the x and y variables is statistically insignificant.
  C) A statistically significant regression slope coefficient indicates that for a one-unit change in y there will be a positive change in x by an amount equal to the regression slope coefficient.
  D) It is acceptable to make predictions for y using x values that are outside the range of the data that was used in the regression.


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xMRAZ

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Reply #1 on: Jun 24, 2018
Answer to Question 1

C

Answer to Question 2

A


cherise1989

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Reply 2 on: Jun 24, 2018
Gracias!

brbarasa

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Reply 3 on: Yesterday
Excellent

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