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)the parameter is $42,000.
B)the sample is unrepresentative.
C)the alpha level is 0.05.
D)the sample mean is $175.

Question

Quizplus · Accepted Answer

The alpha level is 0.05 because a 95% confidence level corresponds to a 5% significance level (100% - 95% = 5%).

A Random Sample of 500 Reports an Average Yearly Income