The graph below describes the journey of a bus between two stops. 8+
a) Work out the
6
acceleration, in m/s?,
in the first 20 s.
b)
D
)
S
Velocity in m/s)
b) Work out the distance
between the two stops.
2
0
0
20
40
60 80 100 120 140 160 180
Time (t in seconds)
c) Work out the average
speed of the bus during
the journey

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.