Aldo would like to make an estimate of the mean amount of time people spend on their phone in his town. Aldo's town has a population of 4,000 people. Which statements are true?

Select each correct answer.

To estimate the mean amount of time people spend on their phone using a sample, Aldo needs to randomly select the people he will survey so that his sample represents the population well.

The larger the number of people that Aldo surveys, the better his estimation will be.

If Aldo collects a sample of just teenagers, he can use that data to estimate the mean amount of time each person spends on their phone in his home town.

To estimate the mean well, Aldo must survey all 4,000 people.