The lifespan of a random sample of 100 Golden Retriever dogs in the U.S. was found to have mean equal to 11.75 years and standard deviation of 1.32 years. (50 years ago the lifespan of Golden Retrievers was much higher at 16 to 17 years. There are scientific studies being conducted as to why the lifespan has been decreasing so rapidly over a relatively short amount of time.) Find a 90% confidence interval for the true mean of the lifespan of Golden Retreivers in the U.S. (Lower Bound = , Upper Bound = ) Round to the thousandths place