Question

Test the claim about the population mean μ at the level of significance α. Assume the population is normally distributed. Write out null and alternative hypotheses, your critical z-score and your z-test statistic. Decide whether you would reject or fail to reject your null hypothesis.

Claim: μ > 28; α = 0.05, σ = 1.2

Sample statistics: x̅ = 28.3, n = 50

H₀:

H_a:

Critical z-score:

Z test statistic:

Decision:

Answer 1