According to the table, for a 95% confidence level, the necessary value for z?/2 is _____ The survey was conducted among a sample of 63 discount brokers, and we are to assume a known population standard deviation of $14. Therefore, n = ____and ? = ____.

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Since the population standard deviation is known, the normal distribution will be used in the calculation of the margin of error, E.
E = z?/2
?
  n
 
The value of
z?/2
is the z value corresponding to an upper tail area of
?
2
and a confidence level of
1 − ?.
Common values for
z?/2
for various confidence levels are given below.
Confidence Level ?
?
2
z?/2
90% 0.10 0.05 1.645
95% 0.05 0.025 1.960
99% 0.01 0.005 2.576
According to the table, for a 95% confidence level, the necessary value for
z?/2
is _____
The survey was conducted among a sample of 63 discount brokers, and we are to assume a known population standard deviation of $14. Therefore, n = ____and ? = ____.
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