Sandra's mail is delivered every day at 10:00. She checks
{"Image DocumentName": "Sandra\u2019s mail is delivered every day at 10:00. She checks", "Image ImageDescription": "her mailbox several times each morning, but only finds. mail the first time she checks after 10:00. This is an. example of a schedule of reinforcement. A. Fixed ratio. B. Variable ratio. C. Fixed interval. D. Variable interval.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}