In a particular city the average annual salary for secretari

In a particular city, the average annual salary for secretaries is $28,000. A sample of 80 secretaries from Company A shows an average annual salary of $29,500 with a population standard deviation of $5,000. Secretaries at Company A claim they are paid less than the city average. With = 0.05 and assuming normal distributions what is the critical value for this claim?

A) -1.65

B) ±1.65

C) 1.96

D) -1.96

Solution

Secretaries at Company A claim they are paid \"less than\" the city average.

Thus, this is a left tailed test.

Thus, at 0.05 level, left tailed, the critical value is

OPTION A: -1.65 [ANSWER]