Suppose weights, in pounds, of dogs in a city are normally distributed and have a known population standard deviation of 5 pounds and an unknown population mean. A random sample of 18 dogs is taken and gives a sample mean of 20 pounds. Find the error bound (EBM) of the confidence interval with a 90% confidence level. z0.10z0.05z0.025z0.01z0.005 1.2821.6451.9602.3262.576 Select the correct answer below: 1.511 1.939 2.310 2.741 2.860 3.036