The number of phone calls that actuary ben receives each day has a poisson distribution with mean 0.1 during each weekday and mean 0.2 each day during the weekend. the number of phone calls that ben receives on one day is independent of the number of phone calls that he receives on other days. if today is monday, what is the probability that ben receives a total of 2 phone calls in a week?

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.