What problems do you foresee if Ford uses the following methods to sample customers who purchased an Expedition (a large SUV) during the last model year? 6 a. Have each dealer send in a list with the...

What problems do you foresee if Ford uses the following methods to sample customers who purchased an Expedition (a large SUV) during the last model year?
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a. Have each dealer send in a list with the names of 5% of its customers who bought an Expedition.

b. Start at the top of the list of all purchasers of Ford vehicles and stop after finding 200 who bought an Expedition.

c. Randomly choose 200 customers from those who voluntarily mailed in customer registration forms.