If there is no relationship between two quantitative variables, ...

[B]

If there is no relationship between two quantitative variables, what slope will the line of best fit have?
 a. 0
 
  b. -1
 
  c. The slope would be undefined.
 
  d. 1

Question 2

Taveen, the production manager at Wire Express, has noticed that one of his machines seems to stall out briefly toward the end of a run. He is wondering whether this stalling is affecting the width of the wire product. He creates several control charts and notices about four consecutive points above the centerline and one point beyond two standard deviations from the centerline. How should Taveen react?

[Edwyer]

Answer to Question 1

b

Answer to Question 2

Taveen probably should not react at all. Four consecutive points above the centerline and one point beyond two standard deviations do not meet the criterion for out-of-control indicators. He should continue to monitor the situation and look for other indications as there might still be a small chance of committing a type II error.