Answer Questions 1-10

Probability & Statistics Name _ Dillon D Chapter 6 - Review Confidence Intervals 1) Find the value of E, the margin of error, for c = 0.90, n = 10 and s = 3.2. 1) 2) A random sample of 40 students has a test score with x = 81.5 and s = 10.2. Construct the 2 ) confidence interval for the population mean, u if c = 0.90. 3) The standard IQ test has a mean of 96 and a standard deviation of 18. We want to be 90% 3) certain that we are within 5 IQ points of the true mean. Determine the required sample size. 4) Construct a 95% confidence interval for the population mean, M. Assume the population 4) has a normal distribution. A random sample of 16 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours. 5) A certain confidence in interval is 6.95