Drivers of semitrucks and other large vehicles pay close attention to signs similar to the one below. these signs indicate a change in the grade or slope of the road. look at the black scalene triangle in the sign. 1. how can the third-angle theorem be applied to find all three angle measurements in the black triangle? 2. are the black triangles above congruent or similar? explain.

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.