A parachute design uses 18 separate pieces of rope. each piece of rope must be at least 270 centimeters and no more than 280 centimeters long. what inequality represents all possible values of the total length of rope x, in centimeters, needed for the parachute? a. 270 ≤ x ≤ 280
b. 4,860 ≤ x ≤ 4,870
c. 4,860 ≤ x ≤ 5,040
d. 5,030 ≤ x ≤ 5,040

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.