A study found that on average dogs were walked 40 minutes each day.An organization of dog walkers used these results to say that their members walked dog 40 minutes each day.Why was this an inappropriate use of the survey results?

• The sample was not large enough to make that conclusion
• Dogs of different breeds need different walking times
• Dogs are walked more than that
• The sample was not narrowed to professional dog walkers
• The sample was of only dog owners