A sample of 12 items yields = 48.5 grams and s = 1.5 grams. Assuming a normal distribution, construct a 90 percent confidence interval for the population mean weight.
A) [47.722, 49.278]
B) [47.788, 49.212]
C) [45.806, 51.194]
D) [47.865, 49.135]

Question

A sample of 12 items yields  = 48.5 grams and s = 1.5 grams. Assuming a normal distribution, construct a 90 percent confidence interval for the population mean weight.
A) [47.722, 49.278] 
B) [47.788, 49.212] 
C) [45.806, 51.194] 
D) [47.865, 49.135]

Quizplus · Accepted Answer

48.5 ± 1.796= 47.722 to 49.278

A Sample of 12 Items Yields = 48