Mathematics, 22.04.2020 20:25 justhereforanswers13
A random sample of 65 light bulbs had a mean life of Xbar = 1535 hours. Construct a 95% confidence interval for the mean life, μ, of all light bulbs of this type. Assume σ = 77 hours.
A) 1510 hr < μ < 1560 hr
B) 1516 hr < μ < 1554 hr
C) 1519 hr < μ < 1551 hr
D) 1521 hr < μ < 1549 hr
E) 1514 hr < μ < 1556 hr
Answers: 3
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A random sample of 65 light bulbs had a mean life of Xbar = 1535 hours. Construct a 95% confidence i...
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