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 $243,793. A real estate broker believes that the mean price has decreased since then. . . ... Which of the following is the correct conclusion? O A. There is not sufficient evidence to conclude that the mean price of a single-family home has decreased. O B. There is sufficient evidence to conclude that the mean price of a single-family home has decreased. O C. There is not sufficient evidence to conclude that the mean price of a single-family home has not changed. O D. There is sufficient evidence to conclude that the mean price of a single-family home has not changed