The hypothesis test yields a very small p-value, so we reject H0. Given the direction of the data, there is very convincing evidence that the police officers have been exposed to a higher concentration of lead than individuals living in a suburban area.

Question

BlackTom AI · Accepted Answer

The statement describes a hypothesis testing result and its interpretation in the context of a directional (one-sided) alternative.

First, consider what a very small p-value implies: the observed data are highly inconsistent with the null hypothesis H0, assuming the null is true. A small p-value indicates that such data would be unlikely under H0, providing evidence against H0.

Second, address the phrase 'Given the direction of the data': if the test was conducted with a specified alternative that the lead concentration in police officers is greater than that in the suburban area (i.e., μ_officers > μ_suburbs), then a small p-value would support the alternative direction. In a properly predefined one-sided test, rejecting H0 in favor of the stated direction means the data are consistent with higher lead exposure among police officers.

Third, acknowledge what the conclusion actually conveys: a very small p-value and rejection of H0 suggest strong statistical evidence against no difference (or against the null of equal means) in the direction specified. However, several caveats apply: the p-value does not measure the magnitude of the difference (effect size), does not guarantee practical significance, and depends on sample size. If the data collection or assumptions (random sampling, independence, normality or appropriate test conditions) are flawed, the conclusion may be unreliable.

Fourth, consider potential alternative explanations or misunderstandings: a two-sided test yielding a small p-value could still indicate a difference in either direction, so the stated direction matters for interpreting 'higher concentration' as evidence; if the analysis was not properly powered or if multiple comparisons were made, the claim could be overstated.

Fifth, examine how the statement reads as a summary: asserting 'very convincing evidence' aligns with a very small p-value in the expected direction, but the wording should remind that statistical evidence is contingent on study design, data quality, and pre-specified hypotheses rather than on p-values alone.

In sum, the interpretive logic connects a small p-value to rejecting H0 in favor of the hypothesized higher exposure, provided the test was appropriately one-sided and assumptions hold; without that alignment, the claim could be misinterpreted or overstated.

FA25_QTM_100_3 7.12 Auto exhaust and lead exposure.

The hypothesis test yields a very small p-value, so we reject H0. Given the direction of the data, there is very convincing evidence that the police officers have been exposed to a higher concentration of lead than individuals living in a suburban area.

View Explanation

Log in for full answers

Similar Questions

Which one is true?

For an upper-tail hypotheses about a population mean with σ known and α=5%, which one is the rejection region?

For a given sample, the P-value for upper tail test is x, and the P-value for two-tailed test is y, then

For a two-tailed hypothesis test with a test statistic value of z = 2.09, the p-value is _____.

For a sample size of 30, changing from using the t distribution to using the standard normal distribution in a hypothesis test _____.

Exhibit 9-5 n = 16 H0: μ ≥ 80 = 75.607 Ha: μ < 80 σ = 8.6 Assume the population is normally distributed. Refer to Exhibit 9-5. The p-value is equal to _____.

Exhibit 9-1 Refer to Exhibit 9-1. If the test is done at a .01 level of significance, the null hypothesis should _____.

What conclusion for a test would correctly detect a difference between the actual parameter and the hypothesized value for the parameter? c08.p089.q0008

More Practical Tools for International Students

Homework AI Solver

Stylized Writing Assistant

Plagiarism Checker Assistant

Citation Assistant

In-Class Translation Assistant

Class Notes Assistant

Quiz Search Assistant

Past Exam Questions by School

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler

FA25_QTM_100_3 7.12 Auto exhaust and lead exposure.

The hypothesis test yields a very small p-value, so we reject H0. Given the direction of the data, there is very convincing evidence that the police officers have been exposed to a higher concentration of lead than individuals living in a suburban area.

View Explanation

Log in for full answers

Similar Questions

Which one is true?

For an upper-tail hypotheses about a population mean with σ known and α=5%, which one is the rejection region?

For a given sample, the P-value for upper tail test is x, and the P-value for two-tailed test is y, then

For a two-tailed hypothesis test with a test statistic value of z = 2.09, the p-value is _____.

For a sample size of 30, changing from using the t distribution to using the standard normal distribution in a hypothesis test _____.

Exhibit 9-5 n = 16 H0: μ ≥ 80 = 75.607 Ha: μ < 80 σ = 8.6 Assume the population is normally distributed. Refer to Exhibit 9-5. The p-value is equal to _____.

Exhibit 9-1 ​ ​ Refer to Exhibit 9-1. If the test is done at a .01 level of significance, the null hypothesis should _____.

What conclusion for a test would correctly detect a difference between the actual parameter and the hypothesized value for the parameter? c08.p089.q0008

More Practical Tools for International Students

Homework AI Solver

Stylized Writing Assistant

Plagiarism Checker Assistant

Citation Assistant

In-Class Translation Assistant

Class Notes Assistant

Quiz Search Assistant

Past Exam Questions by School

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler

Exhibit 9-1 Refer to Exhibit 9-1. If the test is done at a .01 level of significance, the null hypothesis should _____.