You decide to survey people on how satisfied they are with their cell phone provider. However you only send the survey to people who have iPhones. This is likely to generate what type of bias? A. Design Bias
B. Non-Response Bias
C. Under coverage Bias
D. Convenience Bias

Technician a says that with self-adjusting clutch systems, the release bearing constantly rotates. technician b says that the ball bearing portion of the release bearing should be lubricated with high-temperature grease during routine maintenance. which technician is correct?