State the conclusion based on the results of the test. According to the report, the standard deviation of monthly cell phone bills was $48.39 three years ago. A researcher suspects that the standard deviation of monthly cell phone bills is less today. The null hypothesis is not rejected. Choose the correct answer below. O A. There is sufficient evidence to conclude that the standard deviation of monthly cell phone bills is less than its level three years ago of $48.39. O B. There is not sufficient evidence to conclude that the standard deviation of monthly cell phone bills is less than its level three years ago of $48.39. OC. There is sufficient evidence to conclude that the standard deviation of monthly cell phone bills is different from its level three years ago of $48.39.

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