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aama100

  • 4 years ago

What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the standard deviation of their last exam was 12.7? A)2 10.4 <s <16.4 B)2 123.7 <s < 312.7 C)2 122.8 <s < 316.5 D)2 108.6 <s < 269.6

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