A study of the ages of motorcyclists killed in orashes involves the random selection of 140 drivers with a mean of 34.54 years. Assuming that a 10.2 years, construct and interpret a 90% confidence interval estimate of the mean age of all motorcyclists killed in crashes. What is the 90% confidence interval for the population mean p? u<(Round to two decimal places as needed.) Notice that the confidence interval limits do not include ages below 20 years. What does this mean? A. The mean age of the sample will most likely not be less than 20 years old. OB. Motorcyclists under the age of 20 never die in crashes. C. The mean age of the population will most likely not be leoss than 20 years old. O D. The mean age of the population will never be less than 20 years old.
A study of the ages of motorcyclists killed in orashes involves the random selection of 140 drivers with a mean of 34.54 years. Assuming that a 10.2 years, construct and interpret a 90% confidence interval estimate of the mean age of all motorcyclists killed in crashes. What is the 90% confidence interval for the population mean p? u<(Round to two decimal places as needed.) Notice that the confidence interval limits do not include ages below 20 years. What does this mean? A. The mean age of the sample will most likely not be less than 20 years old. OB. Motorcyclists under the age of 20 never die in crashes. C. The mean age of the population will most likely not be leoss than 20 years old. O D. The mean age of the population will never be less than 20 years old.
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Transcribed Image Text:A study of the ages of motorcyclists killed in crashes involves the random selection of 140 drivers with a mean of 34.54
years. Assuming that a= 10.2 years, construct and interpret a 90% confidence interval estimate of the mean age of all
motorcyclists killed in crashes.
What is the 90% confidence interval for the population mean p?
D<u<(Round to two decimal places as needed.)
Notice that the confidence interval limits do not include ages below 20 years. What does this mean?
O A. The mean age of the sample will most likely not be less than 20 years old.
OB. Motorcyclists under the age of 20 never die in crashes.
OC. The mean age of the population will most likely not be less than 20 years old.
O D. The me
age of the population will never be less than 20 years old.
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