2 67 2.53 2 54 2 66 2.51 254 2 62 271 256 2 73 2 67 2 63 a90% c The 90% confiden

Question

2 67 2.53 2 54 2 66 2.51 254 2 62 271 256 2 73 2 67 2 63 a90% c The 90% confidence intervaltoesinato to average price per galio, of pasoline n thestate b hom to Round to tre nearest cent) b. Ds the resuls fr samplo validate the automobile culbi's findings? O A. Since the sna me populak n mean, S263, is not durtaned whin the 90% confidence inervul 30% corderce tat he sample valdates the Since the 90% cartidence that the sample bes can be said win dub's inding elhin the 90% carfidentinervul, k can be said "it, aulonsoblie diti's Sndigs O D. confidence that the sanple valates valdate e an notie chits hips c. What assumptions need to be made aboul this population? O A The only assumption needed is that the population distribution is appreximataly nf O B. The only assumption needed is that the population standard deviation is known O C. The only asurepition needed is thart the population disbution is approximatoly normal

Explanation / Answer

for 90% confidence level and (n-1=14) degree of freedom ; critical value of t =1.7613

therefore 90% confidence interval =sample mean -/+ t*std error =2.60 to 2.67

b)

option C is correct

c)

option C is correct

please revert for any clarification needed.

X 2.53 2.67 2.51 2.72 2.71 2.54 2.74 2.54 2.71 2.56 2.66 2.67 2.62 2.63 2.73 mean(X) 2.636 std deviation(S) 0.081 std error =S/(n)1/2 0.021

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