State the conclusion based on the results of the test. According to the Federal Housing Finance Board, the mean price of a single-family home two years ago was $299,700. A real estate broker believes that because of the recent credit crunch, the mean price has decreased since then. The null hypothesis is not rejected. Choose the correct answer below. OA. There is not sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,700. OB. There is sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,700. OC. There is sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,700. OD. There is not sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,700.