Researchers studied the role that the age of workers has in determining the hours per month spent on personal tasks. A sample of 1,686 adults were observed for one month. The data follow. Construct a 93 percent confidence interval for the mean hours spent on personal tasks for 45- to 64-year-olds.
A) [4.26, 4.36]
B) [4.25, 4.37]
C) [4.27, 4.35]
D) [4.28, 4.34]
E) [2.83, 5.79]

Question

Researchers studied the role that the age of workers has in determining the hours per month spent on personal tasks. A sample of 1,686 adults were observed for one month. The data follow.  Construct a 93 percent confidence interval for the mean hours spent on personal tasks for 45- to 64-year-olds.
A) [4.26, 4.36] 
B) [4.25, 4.37] 
C) [4.27, 4.35] 
D) [4.28, 4.34] 
E) [2.83, 5.79]

Quizplus · Accepted Answer

[x̅ ± t_α_/2,_n₋₁(s/)] = [4.31 ± 1.81(.82/26.019)] = [4.31 ± .057] = [4.25, 4.37]

Researchers Studied the Role That the Age of Workers Has