Author Question: A local transportation planning group is concerned about the lack of car-pooling on the part of ... (Read 69 times)

Deast7027 · **on:** Jun 24, 2018

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 · **Reply #1 on:** Jun 24, 2018

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