A quadrilateral is described as having a set of parallel lines and two congruent angles. Which of the following is it required to be? Check all that apply. (When thinking about what a shape is required to be consider this example: A quadrilateral with 4 right angles is REQUIRED to be a rectangle because that's the definition of a rectangle. It COULD be a square, but doesn't have to be because I didn't say anything about all its sides being the same length)

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.