Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. 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 Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.   1. What is the test statistic and P-Value? 2. State the conclusion for the test. 3. Construct a confidence interval suitable for testing the claim that students taking nonproctored tests get a higher mean score than those taking proctored tests. ____ < μ1 - μ2  < ____

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Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. 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 Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.

 

1. What is the test statistic and P-Value?

2. State the conclusion for the test.

3. Construct a confidence interval suitable for testing the claim that students taking nonproctored tests get a higher mean score than those taking proctored tests. ____ < μ1 - μ2  < ____

Medium Lead Level - High Lead Level
72
n2 = 11
83
92
X2 = 88.284
85
88
S2 = 10.090
97
83
92
101
111
91
Transcribed Image Text:Medium Lead Level - High Lead Level 72 n2 = 11 83 92 X2 = 88.284 85 88 S2 = 10.090 97 83 92 101 111 91
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