According to a report, the standard deviation of monthly cell phone bills was $48.54 three years ago. A researcher suspects that the standard deviation of month 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. Họ: G = $ 48.54

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According to a report, the standard deviation of monthly cell phone bills was $48.54 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.
Họ: o
= $ 48.54
H: o
> $ 48.54
(Type integers or decimals. Do not round.)
(b) Explain what it would mean to make a Type I error. Choose the correct answer below.
O A. The sample evidence did not lead the researcher to believe the standard deviation of the monthly cell phone bill is less than $48.54, when in fact the standard
deviation of the bill is less than $48.54.
O B. The sample evidence did not lead the researcher to believe the standard deviation of the monthly cell phone bill is higher than $48.54, when in fact the
standard deviation of the bill is higher than $48.54.
OC. The sample evidence led the researcher to believe the standard deviation of the monthly cell phone bill is higher than $48.54, when in fact the standard
deviation of the bill is $48.54.
O D. The sample evidence led the researcher to believe the standard deviation of the monthly cell phone bill is less than $48.54, when in fact the standard
deviation of the bill is $48.54.
Transcribed Image Text:According to a report, the standard deviation of monthly cell phone bills was $48.54 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. Họ: o = $ 48.54 H: o > $ 48.54 (Type integers or decimals. Do not round.) (b) Explain what it would mean to make a Type I error. Choose the correct answer below. O A. The sample evidence did not lead the researcher to believe the standard deviation of the monthly cell phone bill is less than $48.54, when in fact the standard deviation of the bill is less than $48.54. O B. The sample evidence did not lead the researcher to believe the standard deviation of the monthly cell phone bill is higher than $48.54, when in fact the standard deviation of the bill is higher than $48.54. OC. The sample evidence led the researcher to believe the standard deviation of the monthly cell phone bill is higher than $48.54, when in fact the standard deviation of the bill is $48.54. O D. The sample evidence led the researcher to believe the standard deviation of the monthly cell phone bill is less than $48.54, when in fact the standard deviation of the bill is $48.54.
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