Score: 0 of 1 pt 17 of 40 (16 complete) HW Score: 30%, 12 of 40 pts 7.3.37 Quest

Question

Score: 0 of 1 pt 17 of 40 (16 complete) HW Score: 30%, 12 of 40 pts 7.3.37 Question Help A study of the ages of motorcyclists killed in crashes involves the random selection of 143 drivers with a mean of 37.24 years. Assuming that = 9.3 years, construct and interpret a 90% confidence interval estimate of the mean age of all motorcyclists killed in crashes. Click here to view a t distribulion tablea normal distribution table lick Click here to view page 2 of the standard normal distribution table. view page 1 of the standard normal distribution table What is the 90% confidence interval for the population mean ? Lu? D-

Explanation / Answer

n = 143 x' = 37.24 = 9.3

z for 90% = 1.645

LCL = x' - z / n = 37.24 - 1.645 * 9.3 / 143 = 35.9607

UCL = x' + z / n = 37.24 + 1.645 * 9.3 / 143 = 38.5193

The confidence interval is 35.9607 < < 38.5193.

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