6. A number of years ago, the fire department in Edmond, OK, began recruiting minority group members through an affirmative action program. In terms of efficiency ratings as compiled by their supervisors, did affirmative action employees tend to have lower efficiency ratings than the regular employees?The ratings of random samples of both groups were collected, and the results are reported here (higher ratings indicate greater efficiency).

Sample 1 (Affirmative action)	Sample 2 (Regular)
x1= 15.2	x2= 15.7
s1= 3.8	s2= 2.5
N1= 105	N2= 123

1. State the hypotheses.

• H₀:₁ _____ ₂

H₁: ₁ _____ ₂

1. Select the sampling distribution and determine the critical region.

Sampling distribution =

=.001

Z (Critical) =

1. Calculate the test statistic.

Assume that the pooled estimate of standard error ( _{x - x}) = 0.32

Z (obtained) =

1. Make a decision and interpret results.

Decision:

Interpretation: