Suppose that Insurance companies did a survey. They randomly surveyed 410 drivers and found that 330 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up.
If this survey were done by telephone, list three difficulties the companies might have in obtaining random results. (Select all that apply.)

a) Children who do not answer the phone will not be included.
b) Only people over the age of 24 would be included in the survey.
c) The individuals in the sample may not accurately reflect the population.
d) Individuals may not tell the truth about buckling up.
e) Individuals may choose to participate or not participate in the phone survey.