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3. We are interested in the variability when considering the effectiveness of different methods of teaching statistics. One group of 9 students is studied and we obtain the following information: n=20 =77.9 s-7921 Assuming the population of students follows a normal distribution, determine a 90% con- fidence interval for σ2.

math   Statistics-And-Probability   
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Given sample n- 20 df n-1-20-1-19 Variance s2-79.21 Level of confidence c 0.90 α 1-0.90-0.10 Critical values χα/2-rå0/2 = 30.

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