Repeat Exercise 16 after replacing the low lead level group
Repeat Exercise 16 after replacing the low lead level group with the following full IQ scores from the medium lead level group.
Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Do the following:
a. Test the given claim using the P-value method or critical value method.
b. Construct a confidence interval suitable for testing the given claim.
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