SOLUTION: A random sample of the ages of 63 college students has a mean of 19. The population is known to be normal with a standard deviation,   , of 3. a. What is the standard err

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Question 865581: A random sample of the ages of 63 college students has a mean of 19. The population is known to be normal with a standard deviation,
 
, of 3.
a. What is the standard error of the mean? (Round to 2 decimal places. Example: 3.87)

b. What is the margin of error, with 95% confidence? (Round to 2 decimal places.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

63 college students has a mean of 19. 

The population is known to be normal with a standard deviation = 3

SE = sd/sqrt(n)= 3/sqrt(63) = .38

ME = 1.96*.38 = .74



CI	z -value

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576