Question
Suppose that a SRS of 900 12th-graders has x̅ =148. Based on this sample, a 95% confidence interval for μ is? (σ=35)
I tried using x̅ +/- z*(σ/sqrt n), so 148 +/- 1.960(35/sqrt900, but it doesn't work. What am I doing wrong?
I tried using x̅ +/- z*(σ/sqrt n), so 148 +/- 1.960(35/sqrt900, but it doesn't work. What am I doing wrong?
Answers
PsyDAG
95% = 148 ± 1.96 (35/30) =148 ± 1.96(1.17) =
148 ± 2.287 = 145.713, 150.287
Is that what you calculated?
148 ± 2.287 = 145.713, 150.287
Is that what you calculated?