Statistical results can be affected by psychological issues. Researchers who conduct experiments need to eliminate sources of bias for their statistical analysis to be meaningful. What are some potential causes of bias in the following samples?

1. Super Cola pays for a taste test study comparing it to Amazing Cola. Participants were asked to taste both drinks and pick their favorite. Super Cola is labeled “$m$” and the Amazing Cola, “$q$”. The majority of participants pick the drink labeled “$m$”.

   Hint (a):

   Is there a bias for or against letters of the alphabet?

2. A survey is conducted in the following manner: “The Bill of Rights guarantees the right to bear arms so that we can protect our families and our country. Recently, attempts have been made to enact stricter gun controls. Do you want these restrictions?”

   Hint (b):

   What does the Bill of Rights really say? Does it include 'protect'?

3. Another survey is conducted in the following manner: “Last year over $15,000$ people were murdered by handguns, which accounted for $68\%$ of all murders. Recently, attempts have been made to enact stricter gun controls. Do you want these restrictions?”

   Hint (c):

   Will the introduction sway the reader?