3. (10 points) The average yearly wages for police officers with four or more years of experience in the city of Los Angeles is $95,000. A group of 36 female police officers, with four or more years of experience, in the Los Angeles police department approach you with a complaint regarding their yearly income. They average $86,000 a year in wages with a standard deviation of $18,000. Test against a Za/2 = 1.96 to see if the difference is statistically significant (not due to random variation)