given that z is a standard normal random variable what is the probability that z ≥...
given that z is a standard normal random variable what is the probability that z ≥ -2.12?
a. 0.966
b. 0.017
c.4830
0.9830
From a population of 200 elements, a sample of 49 elements is selected. It is determined that the sample mean is 56 and the sample standard deviation is 14. The standard error of the mean is
a. 3
b. 2
c. greater than 2
d. less than 2
Homework Answers
solution:
p(z ≥ -2.12)=1-0.017
=0.9830
correct option (d)
solution given that
n=49
=14
standard error =(
/
n)
=14/49
standard error=2
correct option b
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