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A random sample of 500 individuals reports an average yearly income of $42,000 with a standard deviation of $1000. An estimate of the parameter at
A random sample of 500 individuals reports an average yearly income of $42,000 with a standard deviation of $1000. An estimate of the parameter at the 95% level is about $175 wide. In this research situation:
Group of answer choices:
a. The sample is unrepresentative
b. The sample mean is $175
c. The alpha level is 0.05
d. The parameter is $42,000
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