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Time iniq mints u wish to estimate the average life of a type of light bulb. You plan to take a random sample of 25 bulbs and burn them continuously until they burn out Assurne that the length life is normally distributed for all bulbs of this type. The only other information you'll have will come from your sample. What procedure would be most appropriate? A hypothesis test regarding using the Z distribution Finding the probability of the observed sample proportion A confidence interval for using the t distribution A confidence interval for using the Z distribution