Question

MATI STAT 215 QUIZON CHAPTERS, FALL 2012 Qas 1 : Fifty people in a civilian labor force are randomly selocted: their ages are displayed in Table 1.0. Assume that the paperation standard deviation of the ages is 12.85 years. Table 1.0 11 30 41 35 20 50 43 50 34 42 46 47 a. Determine the margin of error for ife 95% confidence interval (5 nyarks) 26 of all people in the h. Hence, find a 95% confidence interval for the mean age of, civilian labor force. (5 marks)

Answer 1

Apswer Crittal value x Standard denaion al Marain of eysor NXStandayd devati Zo.05 X2.85 64 X 12.85 = 21.074 Marain of eor for the 95 % Confidence nterva is a1.074

bl is aiven b g5 Confidence interval foY mean aae of M X-Marzin of eyror Xain ot er here X 31.66 95 Contidence interval tor mean aae of M of all People in the civilian la bour torce is 31.06+ 31.0 (31.6-21074 = (28.6803 34.639)