A random sample of 105 light bulbs had a mean life of x¯=441x¯=441 hours with a standard deviation of σ=40σ=40 hours. Construct a 90% confidence interval for the mean life, μ, of all light bulbs of this type.
Use the confidence level and sample data to find a confidence interval for estimating the population μ. Round your answer to the same number of decimal places as the sample mean. A random sample of 105 light bulbs had a mean life of x¯=441x¯=441 hours with a standard deviation of σ=40σ=40 hours. Construct a 90% confidence interval for the mean life, μ, of all light bulbs of this type.
A random sample of 105 light bulbs had a mean life of x¯=441x¯=441 hours with a standard deviation of σ=40σ=40 hours. Construct a 90% confidence interval for the mean life, μ, of all light bulbs of this type.