A sample of 81 observations from a normal population is taken with a
1. A sample of 81 observations from a normal population is taken with a standard deviation of 5. The sample mean is 40 Determine the confidence interval of 95% for the population mean. 2. MacBurger restaurant chain claims that the waiting time of customers is 3 minutes with a population standard distribution of 1 minute. The quality control department found a sample of 50 clients […]