The IQ scores for a random sample of subjects with medium lead levels in their b

Question

The IQ scores for a random sample of subjects with medium lead levels in their blood and another random sample of subjects with high lead levels in their blood are given below. Use a 0.01 significance level to testthe claim that subjects with medium lead levels have full lQ scores with a higher median that the median full IQ score for subjects with high lead levels. Does lead level appear to affect full lQ scores? BEE Click the icon to view the data table. First define the null and alternative hypotheses. Ho: The two populations have different medians. H1: The medium lead level population has a higher median lQ than the high lead level population Identify the test statistic ZE 1.57 (Round to two decimal places as needed Calculate the P-value. P-value 0645 (Round to four decimal places as needed.) Choose the correct answer below. O A. Reject Ho. There is insufficient evidence to support the claim B. Fail to reject Ho. There is insufficient evidence to support the that subjects with medium lead levels have full IQ scores with claim that subjects with medium lead levels have full lQ a higher median than subjects with high lead levels. scores with a higher median than subjects with high lead levels O c. Fail to reject H There is sufficient evidence to support the O D. Reject Ho. There is sufficient evidence to support the claim that subjects with medium lead levels have full IQ scores with claim that subjects with medium lead levels have full lQ scores with a higher median than subjects with high lead a higher median than subjects with high lead levels. levels Does lead level appear to affect full IQ scores?

Explanation / Answer

Here H0: The two samples come from population with equal medians.

ag. H1: The medium lead level population has a higher median IQ than the high lead level population.

Since p-value = 0.0645 > 0.01, we fail to reject H0. There is insufficient evidence to support the claim that subject with median lead levels have full IQ score with a higher median than subjects with high lead levels, So option (B) is the correct choice.

It doesn't appear that lead level effects full IQ scores as there is insufficient evidence.to support the claim. So option (C) is the correct choice.

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