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step by step please A candle making process is known to produce candles whose life times have a variance of 0.4 hours. However, the average

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A candle making process is known to produce candles whose life times have a variance of 0.4 hours. However, the average lifetime is unknown. The lifetimes of a random sample of six candles turned out to be 8.1, 8.7, 9.2, 7.8, 8.4, 9.4 hours respectively. Find a 98% confidence interval for the population mean

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