A random sample of 94 light bulbs had a mean life of x-bar 587 hours with a standard deviation of sigma 36 hours. Construct a 90 percent confidence interval for the mean life of all light bulbs of this type:
578 < H < 596
b) 581 < u < 503
577 < H < 597
SS0 < 4 504|
Question 13 (5 points): Use the margin of error, confidence level, and standard deviation (sigma) to find the minimum sample size required to estimate an unknown population mean (mu): Margin of error: $133, confidence level 95%, sigma 5530.