In a study of factors affecting whether soldiers decide to reenlist, 320 subjects were measured for an index of satisfaction. The sample mean is 28.8 and the sample standard deviation is 7.3. Use the given sample data to construct the 98 percent confidence interval for the population mean for level of satisfaction.
A) [27.85, 29.75]
B) [27.96, 29.64]
C) [11.82, 45.78]
D) [28.75, 28.85]
E) [28.60, 29.00]

Question

Quizplus · Accepted Answer

[± ] = [28.8 ± 2.326(7.3/ 17.89)] = [28.8 ± .949]
= [27.85, 29.75]

In a Study of Factors Affecting Whether Soldiers Decide to Reenlist