AP Stats Conditions for inference

Question

A popular infomercial wants to know the proportion of viewers that prefer gold to silver jewelry. Viewers are asked to text "gold" or "silver" to a provided number. Seventy-seven percent of the 5,000 people that responded texted "gold." Which condition for inference has NOT been met?

a) All conditions appear to be met. 

b) N > 10n 

c) np ≥ 10 and n(1 - p) ≥ 10

d) Inference about a proportion is the objective. 

e) The sample is an SRS of the population.

Answer 1

The sample is not an SRS, it is a voluntary sample.