1.)459 randomly selected light bulbs were tested in a laboratory, 291 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.
2.)Find the critical value for zα/2 that corresponds to a degree of confidence of 98%.
3.)Find the critical value for tα/2 corresponding to n = 12 and 95% confidence level.
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