18 -person road crew is scheduled to finish repairing a highway in 10 days. On the morning of the fifth day, several workers of the crew were moved to another project. How many workers were removed from the crew, if the rest of the crew finished the remaining repairs in 12 days?

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.