50 points! The campaign manager for one of the five candidates running for office in a city wants to conduct a survey to see how popular his candidate is among all voters in the city. He chooses the first name on a voter registration list at random then goes through the list, choosing every 15th name after that, cycling through the whole list until he ends up where he started. What type of sampling method did the campaign manager use?
A.) Non-random sampling

B.) Simple random sampling

C.) Systematic random sampling

D.) Stratified random sampling

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.