According to a​ report, the standard deviation of deviation of monthly cell phone bill was ​$48.93 three years ago. A researcher suspects that the standard deviation of deviation of monthly cell phone bill  is different from different from today. ​(a) Determine the null and alternative hypotheses. ​(b) Explain what it would mean to make a Type I error. ​(c) Explain what it would mean to make a Type II error.

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