Answer:
0.95
Step-by-step explanation:
19/20 = 19*5/20*5 = 95/100 = 0.95
Answer:
A is the answer
Step-by-step explanation:
Answer:
n=40 boys
Step-by-step explanation:
-Margin of error is given by the formula:
-The z score for a probability of 92% is 1.75
#We make n the subject of the formula and substitute at a 92% confidence:
Hence, he needs approximately 40 boys for the study