Q1) One way MSNBC solicits the opinions of its news consumers is through the organization's online Speak Out surveys. Using social media and its television and radio news shows, MSNBC encourages its news consumers to go online and respond to various opinion polls about trending topics. Typically the polls remain open. In one ongoing Speak Out poll, MSNBC asks whether marijuana should be legalized, decriminalized, or illegal. As of May 10th, 2015, more than 26,000 people had responded to the poll, and 77% indicated that marijuana should be legalized.

_ an observational study

_ an experiment

Q2) Chemicals in butter-flavoring:Workers in a microwave popcorn production plant in Missouri breathe chemicals that are part of the butter-flavoring. Are these workers at greater risk of developing lung problems? To investigate this question, 135 workers at the plant receive a survey, and 117 respond.

Researchers want to compare workers in the popcorn production area with workers who have jobs in other parts of the plant. People in these other jobs are not directly exposed to the butter flavorings. Of the 97 workers in the production area, 30 reported experiences of "shortness of breath." Of the 20 workers in other jobs, only 1 reported "shortness of breath."

What can we conclude from this study?Check all that apply.

_ Exposure to the chemicals in butter-flavoring is associated with a greater incidence of lung problems, such as shortness of breath.

_ The chemicals in the butter-flavorings are causing shortness of breath because a much larger percentage of workers in the production area have shortness of breath.

_ Workers exposed to the chemicals in the butter-flavoring have a higher risk of developing respiratory problems such as shortness of breath.