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Suppose a telephone poll is conducted by contacting U.S. citizens via landlines about their view on...

Suppose a telephone poll is conducted by contacting U.S. citizens via landlines about their view on stricter gun control laws. Suppose over 50% of those called do not support stricter gun control laws. Does this mean that you can say over 50% of all people in the U.S. do not support stricter gun control laws? Explain

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Answer #1

Suppose over 50% of those called do not support stricter gun control laws. Does this mean that you can say over 50% of all people in the U.S. do not support stricter gun control laws?

We can not say that 'over 50% of all people in the U.S. do not support stricter gun control laws' because this information is based on a telephonic interview the subjects might show response bias (misleading or untruthful response). Many people might not be interviewed since access and time will be constraint. But using proper randomisation and ensuring independence the decisions can be made. This is possible using hypothesis testing tools or confidence intervals. These tools help to reach a decision based on a sample with certain risk (5%, 1%, 10%).

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