A sample of 16 small bags of the same brand of candies was selected. The weight of each bag was then recorded. The mean weight was 2 ounces. The population standard deviation is known to be 0.1 ounce. Construct a 90% confidence interval for the population average weight of the candies. Construct a 95% confidence interval for the population average weight of the candies. Explain why the 95% interval is wider than the 90% interval. Do you think this is true always?