Aprofessor must randomly select 4 students to participate in a mock debate. there are 15 students in his class. in how many different ways can these students be selected, if the order of selection does not matter?

Need solving this 2nd limit problem.

Put the following steps for calculating net worth in the correct order

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.