B Saxe the tesitl stalisc is ore than the critical vallue we

B. Saxe the tesitl stalisc is ore than the critical vallue, we cannot conclude hat the average age of cars on the soad is less than 12 years OC. Snce the bnd ?1hn?ihan crecal value we canot concludethatthe average age ofers on Be road is lessha, 12 years

Solution

z=|(10.6-12)/(4.1/sqrt(45))|=2.29

for 5% z critical value is 1.69 hence our calculated z value exceeds this value

therefore we can reject the hypothesis

Option B is correct answer