Train a traveled 173 miles in five hours. for train b, y = 31.35x represents its rate of speed over the same five hours. which train traveled at a faster rate and by what factor? (round to nearest tenth)
a) train b by a factor of 3.2 *my answer
b) train a by a factor of 3.2
c) train b by a factor of 1.1
d) train a by a factor of 1.1 *the correct answer?
can someone explain how d is the correct answer, because i'm really confused : /

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.