50 40
Two boats A and B leave port P at the same
time. Boat A sails 30 km in the North east
direction and boat B sails 20 km on a bear
ing of 300
What is the distance between the two
boats?
b) What is the bearing of boat A from boat
B
A man travels from a village X on a bearing
of 060 to a village Y, which is 20 km away
From Y. he travels to a village Z. on a bearing
of 195. IZ is directly east of X. calculate
correct to three significant figures the dis
tance of
(a) Y from Z hy Z from X (WAEC)
fer​

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.