Question

jack wants to know how many families in his small neighborhood of 60 homes would help organize a neighborhood fund-raising party. He put all the addresses in a bag and drew a random sample of 30 addresses. He then asked those families if they would help organize the fund-raising party. He found that 12% of the families would help organize the party. He claims that 12% of the neighborhood families would be expected to help organize the party. Is this a valid inference ?

Answer 1

No, that would be an invalid inference because he actually sampled from only half of the total population not the entire population.

so 12% of the 50% he sampled would be valid, but since he did not use the entire population, the results cannot affect all of them.