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You are introducing sampling bias by going to social media/cycle groups. If you want to find out what people on Facebook cycling groups think then that's fine, if you want to draw conclusions about what people who cycle think then or what a representative cross section of the public think you'll have to find a more random way to find interviewees. You'll probably need more to draw any decent conclusions.
dst2
drewtheshrew
I interviewed 12 people, all from various Facebook cycling groups, of varied demographic.