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The standard deviation of daily iron intake in the larger population of 9 to 11 year-old boys was 5.56 mg. We want to test whether the standard deviation from the low-income group is comparable to that of the general population. 1. State the hypotheses that we can use to answer this question. 2. Carry out the test using the critical-value method with an a level of 0.05, and summarize your findings. 3. What is the p-value for the test ? 4. Compute a 95% CI for the underlying variance of daily iron intake in the low-income group, what can you infer from this CI?
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