A random sample of 500 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
a. we can be 95% confident that the population mean is 42,000 ± 175.
b. the sample size is much too small to justify the use of estimation procedures.
c. the alpha level is 1000.
d. the sample mean is $175.
ANSWER: a
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