Apolling company has decided to increase the size of its random sample of voters from about 1,000 people to about 2,800 people right before an election. a poll was designed to estimate the proportion of voters who favor a new law banning cell phone use in internet coffee shops. what is the effect of this increase?

a. to reduce the variability of the estimate
b. to increase the variability to the estimate
c. to reduce the bias of the estimate
d. to increase the bias of the estimate
e. this increase will have no effect because the population size is the same

A. To reduce the variability of the estimate

Step-by-step explanation:

The larger the sample, the less variability there is.

The smaller the sample, the more variability there is.

Bias has to do with how randomly the sample is selected.  Assuming that method doesn't change, the bias doesn't change.

step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.