Afellow classmate tosses 3 coins and finds that 2 of them come up tails. which of the following is the best conclusion for her to come to?
a) the coins are unfair
b) this could easily happen with a fair coin after only 3 flips
c) she needs to keep flipping the coins until she gets 50% heads in order to determine if they are fair
d) if she flips the coins once more , they will all come up heads

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.