In a situation where the population standard deviation was known rather than the sample standard deviation, what

would be the impact on the confidence interval?

It would remain the same as standard deviation does not impact confidence intervals

It would become wider due to using the z distribution

It would become narrower with fewer values

It would become narrower due to using the z distribution

A company claims that its heaters last less than 5 years. Write the null and alternative hypotheses and note which is the claim.

Ho: μ > 5 (claim), Ha: μ ≤ 5

Ho: μ ≥ 5, Ha: μ < 5 (claim)

Ho: μ ≤ 5, Ha: μ > 5 (claim)

Ho: μ = 5 (claim), Ha: μ ≥ 5

An executive claims that her employees spend less than 2.5 hours each week in meetings. Write the null and alternative hypotheses and note which is the claim.

Ho: μ < 2.5 (claim), Ha: μ ≤ 2.5

Ho: μ ≤ 2.5 (claim), Ha: μ > 2.5

Ho: μ ≤ 2.5, Ha: μ < 2.5 (claim)

Ho: μ ≥ 2.5, Ha: μ < 2.5 (claim)

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