Question: Question 11 (4 points): Insulators produced by a factory have a breakdown voltage distribution that can be approximated by a normal distribution. Determine a 95%

Question 11 (4 points): Insulators produced by a

Question 11 (4 points): Insulators produced by a factory have a breakdown voltage distribution that can be approximated by a normal distribution. Determine a 95% confidence interval for the mean of the breakdown voltage distribution with variance o' =4, using a sample of n=100 with sample mean x =6. Confidence Interval for u of the Normal Distribution with Known o? Table 25.1 Determination of a Confidence Interval for the Mean u of a Normal Distribution with Known Variance ? Step 1. Choose a confidence level y (95%, 99%, or the like). Step 2. Determine the corresponding c: 0.90 0.95 0.99 0.999 C 1.645 1.960 2.576 3.291 Step 3. Compute the mean i of the sample x1, ..., Xn. Step 4. Compute k = co/Vn. The confidence interval for u is CONF, { k Su Sa+k}

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