Political pollsters now make sure to conduct a percentage of their telephone interviews by calling mobile phones. this policy best addresses which potential source of bias?

lack of access

Explanation:

If they use the mobile phones there are high chances that they won't get everyone through the phone , they may be shortage of responses or insufficient data collection due to the fact that not everyone would answer to this pollsters and they may not even have access to enough mobile phones.

it is one of the most important farming areas in the united states. along with farming, the region has a huge manufacturing industry. the midwest region's climate and natural resources are important to its economy. the eastern part of the region has a lot of rainfall.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.