The Specific Absorption Rate (SAR) for a cell phone measures the amount of radio frequency (RF) energy absorbed by the user's body when using the handset. Every cell phone emits RF energy. Different phone models have different SAR measures. To receive certification from the Federal Communications Commission (FCC) for sale in the United States, the SAR level for a cell phone must be no more than 1.4 watts per kilogram. A sample of 90 models was tested and the average of their Specific Absorption Rates (SARs) was found to be 1.2 watts per kilogram. Assume that the population standard deviation is 0.25 watts per kilogram.
Construct a 96% confidence interval for the mean of the SARs for cell phones that received certification from FCC.
Procedure:
Assumptions: (select everything that applies)
Unknown parameter:
Point estimate:
=watts per kilogram (Round the answer to 2 decimal places)
Confidence level % and α= , also
2α= , and 1−2α=
Critical values: (Round the answer to 2 decimal places)
left= right=
Margin of error (if applicable): (Round the answer to 2 decimal places)
Lower bound: (Round the answer to 2 decimal places)
Upper bound: (Round the answer to 2 decimal places)
Confidence interval:(, )
Interpretation: We are % confident that the mean of the SARs for cell phones that received certification from FCC is between watts per kilogram and watts per kilogram.
Based on the confidence interval, is it reasonable to believe that the mean of the SARs for cell phones that received certification from FCC is less than 1.4 watts per kilogram? Explain.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.
Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity Your answer should include exactly 2 decimal places.