A random sample of 120 light bulbs had a mean life of x bar
A random sample of 120 light bulbs had a mean life of x bar = 446 hours with a standard deviation of q= 35 hours construct a 90 percent confidence interval for the mean life, u, of all light bulbs of this type.
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a random sample of 120 light bulbs had a mean life of x bar 446 hours with a standard deviation of q 35 hours
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