Question: =+14.11. A small random sample was used in an experiment to see how effective an informative newsletter was in persuading people to favor a flat

=+14.11. A small random sample was used in an experiment to see how effective an informative newsletter was in persuading people to favor a flat income tax bill. Thirty persons were asked their opinion before receiving the letter and these same persons were then asked again after receiving the letter. Before the letter, 11 were in favor. Five were in

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