một máy chứa nước ngọt mỗi lần có thể rót trung bình là 200ml một cốc. giả sử lượng nước ngọt rót trong mỗi lần có phân phối xấp xỉ chuẩn với độ lệch chuẩn là 15ml

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.