Expedia would like to test the hypothesis that the proportion of Southwest Airline flights that arrive on- time is less than 0.90. A random sample of 140 United Airline flights found that 119 arrived on- time. Expedia would like to set ? = 0.05. The test statistic for this hypothesis test would be ______.
A)$${ } ^ { 2 } v$$ = - 1.97
B)$${ } ^ { 2 } v$$ = - 1.22
C)$${ } ^ { 2 } v$$ = - 2.67
D)$${ } ^ { 2 } v$$ = - 2.30

Question

Quizplus · Accepted Answer

The test statistic for this hypothesis test would be -1.97. This is because the sample proportion of flights that arrived on-time is 119/140 = 0.85, which is less than the hypothesized proportion of 0.90. The test statistic is calculated as (0.85 - 0.90) / sqrt(0.90 * 0.10 / 140) = -1.97.

Expedia Would Like to Test the Hypothesis That the Proportion 2v{ } ^ { 2 } v2v

Expedia Would Like to Test the Hypothesis That the Proportion ${ } ^ { 2 } v$