Three years ago, the mean price of an existing single-family home was $243,783. A real estate broker believes that existing home prices in her neighborhood are higher. (a) Determine the null and alternative hypotheses. (b) Explain what it would mean to make a Type I error. (c) Explain what it would mean to make a Type II error. (a) State the hypotheses. Ho: H1: (Type integers or decimals. Do not round.)