Chapters 8 Assignment 1. A random sample of 100 households in Whatcom County yielded an average household income of $76,000, with a sample standard deviation of $3,600. Assume the distribution of household income is Normal. a. Use this information to compute a 95% confidence interval for the population mean household income in Whatcom County. Please clearly show that you checked to make sure the data meet all necessary conditions for inference. b. Interpret the meaning of the confidence interval you found in part a in the context of this application