Suppose the null hypothesis is not rejected. State the conclusion based on the results of the test. Three years ago, the mean price of a single-family home was $243 comma 790. A real estate broker believes that the mean price has decreased since then. Which of the following is the correct conclusion? A. There is not sufficient evidence to conclude that the mean price of a single-family home has decreased. B. There is sufficient evidence to conclude that the mean price of a single-family home has not changed. C. There is sufficient evidence to conclude that the mean price of a single-family home has decreased. D. There is not sufficient evidence to conclude that the mean price of a single-family home has not changed.