According to a report, the standard deviation of monthly cell phone bills was $48.91 three years ago. A researcher suspects that the standard deviation of monthly cell phone bills is higher today. (a)...

Extracted text: According to a report, the standard deviation of monthly cell phone bills was $48.91 three years ago. A researcher suspects that the standard deviation of monthly cell phone bills is higher 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 Il error. (a) State the hypotheses. Но H4: (Type integers or decimals. Do not round.)