Suppose that you have a sample of size n=14 with mean 7 and sample standard deviation s=4. A 90% confidence interval for the population mean, μ, is closest to: ??

1. (5.569,8.431)

2. (5.107 ,8.893)

3. (5.780,7.146)

4. (5.591,7.409)

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem