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IQ scores for a random sample of subjects wit another random sample of subjects with high I cted. The statistics are summarized in the acc wo samples are independent simple random s ibuted populations. Do not assume that the po al. Complete parts (a) to (c) below.

IQ scores for a random sample of subjects wit another random sample of subjects with high I cted. The statistics are summarized in the acc wo samples are independent simple random s ibuted populations. Do not assume that the po al. Complete parts (a) to (c) below.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The statistics are summarized in the accompanying table. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. n S Low Lead Level H1 88 93.97345 15.96759 High Lead Level H2 22 87.55119 8.83761 The test statistic is (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) State the conclusion for the test. A. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. B. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. C. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher 1Q scores. D. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. b. Construct a confidence interval appropriate for the hypothesis test in part (a). (Round to one decimal place as needed.) c. Does exposure to lead appear to have an effect on IQ scores? because the confidence interval contains
Transcribed Image Text:The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The statistics are summarized in the accompanying table. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. n S Low Lead Level H1 88 93.97345 15.96759 High Lead Level H2 22 87.55119 8.83761 The test statistic is (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) State the conclusion for the test. A. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. B. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. C. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher 1Q scores. D. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. b. Construct a confidence interval appropriate for the hypothesis test in part (a). (Round to one decimal place as needed.) c. Does exposure to lead appear to have an effect on IQ scores? because the confidence interval contains
The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The statistics are summarized in the accompanying table. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. X Low Lead Level H1 88 93.97345 15.96759 High Lead Level H2 22 87.55119 8.83761 a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with low lead levels and population 2 consists of subjects with high lead levels. B. Họ: H1 SH2 H1: Hy> H2 A. Ho: H1 = H2 H1: Hy> H2 OC. Ho: H1 = H2 O D. Ho: H1 # H2 H4: Hy> H2 The test statistic is (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) State the conclusion for the test. A. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. B. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. Reiect the pull hynothesis There is pot sufficient evidence to supnort the claim that subiects with low lead levels bave hiaber IO scores
Transcribed Image Text:The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The statistics are summarized in the accompanying table. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. X Low Lead Level H1 88 93.97345 15.96759 High Lead Level H2 22 87.55119 8.83761 a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with low lead levels and population 2 consists of subjects with high lead levels. B. Họ: H1 SH2 H1: Hy> H2 A. Ho: H1 = H2 H1: Hy> H2 OC. Ho: H1 = H2 O D. Ho: H1 # H2 H4: Hy> H2 The test statistic is (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) State the conclusion for the test. A. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. B. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. Reiect the pull hynothesis There is pot sufficient evidence to supnort the claim that subiects with low lead levels bave hiaber IO scores
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