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Exercise 12 The amount of current required to achieve a particular brightness level in a color TV picture tube is normally distributed. A random sample

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Exercise 12 The amount of current required to achieve a particular brightness level in a color TV picture tube is normally distributed. A random sample of 9 tubes produced the following values: 312 318 319 321 316 320 319 315 317. (a) Find a 95% two-sided confidence interval for the average amount of current

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