State the conclusion based on the results of the test. According to the report,

Question

State the conclusion based on the results of the test. According to the report, the standard deviation, of cell phone was $48.87 three years ago. A objects that the standard deviation of monthly cell phone bills in different today. The null hypothesis is rejected. Choose the correct answer below. A. These is sufficient evidence to conclude that the standard deviation of monthly cell phone bills is higher than its level three years ago of $48.87. B. There is not sufficient evidence to conclude that the standard deviation of monthly cell phone bills is different from its level three years ago of $48.87. C. There is sufficient evidence to conclude that the standard deviation of monthly cell phone bills is different from its level three years ago of $48.87.

Explanation / Answer

Here the null hypothesis is rejected. So the standard deviation is different from that of 3 years ago i.e. 48.87.

Hence the decision is there is sufficient evidence to conclude that the standard deviation of monthly cell phone bills is different from 3 years ago. Thus, Option (C) is the correct choice. (Ans).

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