Milena wants to power toy cars and helicopters using batteries. Her goal is to power at least 11 toys (condition A) with at most 60 batteries (condition B). The graph represents the constraints on the number of cars C and helicopters H Milena powers. What is the greatest number of helicopters Milena can power while meeting both her constraints?

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.