1. How much do the American public health professionals earn on average? To find out the average salary, a random sample

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1. How much do the American public health professionals earn on
average? To find out the average salary, a random sample of 144
public health professionals were taken. The sample data showed that
the mean annual salary is $53,145, with a standard deviation of
$16, 451. Pls answer the following questions:
A) Calculate the standard error of the mean salary
B) Find out the margin of error (90% confidence) based on the
above information (Use the Z distribution).
C) Construct a 90% confidence interval of the mean salary.