Use the confidence level and sample data to find a confidence interval for estim
ID: 3362910 • Letter: U
Question
Use the confidence level and sample data to find a confidence interval for estimating the population . Round your answer to the same number of decimal places as the sample mean.A random sample of 104 light bulbs had a mean life of x = 543 hours with a standard deviation of 26 hours Construct a 90% confidence interval for the mean life, , of all light bulbs of this type. Use the confidence level and sample data to find a confidence interval for estimating the population . Round your answer to the same number of decimal places as the sample mean.
A random sample of 104 light bulbs had a mean life of x = 543 hours with a standard deviation of 26 hours Construct a 90% confidence interval for the mean life, , of all light bulbs of this type. Use the confidence level and sample data to find a confidence interval for estimating the population . Round your answer to the same number of decimal places as the sample mean.
A random sample of 104 light bulbs had a mean life of x = 543 hours with a standard deviation of 26 hours Construct a 90% confidence interval for the mean life, , of all light bulbs of this type.
Explanation / Answer
CI for 90% n 104 mean 543 z-value of 90% CI 1.6449 std. dev. 26 SE = std.dev./sqrt(n) 2.54951 ME = z*SE 4.19357 Lower Limit = Mean - ME 538.80643 Upper Limit = Mean + ME 547.19357 90% CI (538.8064 , 547.1936 )
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