H2 Maths 6.5 - One-Tailed Z-Test for Population Mean
What you will learn
- Claim: cans contain mean 330 ml; consumer group tests lower one-tail at 5% significance with n = 100, x-bar = 328.5, sigma = 7.5.
- Standard error = sigma / sqrt(n) = 0.75; test statistic z = (328.5 - 330) / 0.75 = -2.
- p-value = P(Z < -2) = 0.0228, which is less than alpha = 0.05.
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