1) Which type of statistical study is best to determine whether or not texting while waking along city streets is a safety risk to pedestrians? This risk to safety can be measured by whether the pedestrian looks before stepping into the street, it the pedestrian crosses at a crosswalk and how much time the pedestrian spends crossing the street a. Observational study b. Single-blind experiment Case-control study d Double-blind experiment. 2) in a study to determine whether a new brand of neo-natal vitamins (vitamins given to pregnant women so they have healthier babies) is more effective than a leadine brand, which of these statistical studies would be the most appropriate? During the study, the doctors will be collecting both quantitative data (numerical data drawn from blood analysis, weighing, etc.) as well as data about their overall disposition, how they feel energy levels, etc. d. Observational study b. Single-blind experiment Double-blind experiment. I d. Case-control study 3) A recent survey by Rasmussen Reports found that 78% believe the US soles on other countries as much as or more than other countries spy on the US. The margin of error for this study is 3% Which of the following can be stated with 95% confidence! The actual percentage that believe the US, spies on other countries as much as or more than other countries spy on the US, is between 78% and 835 b. The actual percentage that believe the US sples on other countries as much as or more than other countries spy on the US is between 75 and 815 The actual percentage that believe the US sples on other countries as much as or more than other countries spy on the US between 75 and 789 d. The actual percentage that believe the US, spies on other countries as much as or more than other countries spy on the US 378