A local transportation planning group is concerned about the lack ...

[Deast7027]

A local transportation planning group is concerned about the lack of car-pooling on the part of commuters. They are afraid that the proportion of local drivers car-pooling is below the national average of 15.
 
  A survey of 400 local drivers reveals that 12.22 of them car pool. Is there evidence that the actual proportion of local commuters car-pooling is less than 15? Test at the 10 level of significance.

Question 2

What is Trance Electronics' market share in the fifth year?
 
  A) 12.25
  B) 15.74
  C) 10.35
  D) 13.69

[Sassygurl126]

Answer to Question 1

H0 : P = 0.15 against H1: P < 0.15
Test statistic
Z = (.122 - .15 ) / = -1.56
Since p-value = P(Z < -1.56 ) = 0.0594, we reject null hypothesis at  = 0.10. There is sufficient evidence that the actual proportion of local commuters car-pooling is less than 15.

Answer to Question 2

B

[Deast7027]

Great answer, keep it coming

[atrochim]

Excellent