Kadeesha recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Eighth Grade Students
Instrument # of Students
11
Instrument # of Students
Guitar
14
Bass
3
Drums
12
Keyboard
2
12
Guitar
Bass
Drums
Keyboard
7
4
Based on these results, express the probability that a seventh grader chosen at
random will play the keyboard as a fraction in simplest form.

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.