Multiple Choice
900 secondary school students are selected randomly from across the country because they have achieved 10 GCSEs at grade A -C.There is a standard deviation of 0.4.Assuming a 95% confidence rate,what is the margin of error?
A) 0.011
B) 0.025
C) 0.178
D) 0.555
Correct Answer:
Verified
Correct Answer:
Verified
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