Assignment Task
Task
The quality of subway service is one of the big issues facing NYC today. You are working with the non-profit Straphangers.org to assess the quality of service on our city’s subways. For each subway line, you take 100 randomly sampled rides, and rate your ride with respect to (a) DELAY, which isthe number of minutes that you waited for a train to arrive, and (b) CLEANLINESS of car, where 0 = unacceptable and 1 = acceptable, and (c) STANDING (the number of people standing within 6 feet of you, after you enter the car). Here are some summary statistics
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Get Help Now!For each of the multiple choice questions below, select the one best answer.
- 1To test whether delays were longer on the B train than the A train, you would use:
- A two tailed test of the difference of means
- A one tailed test of the difference of means
- A one tailed test of the difference of proportions
- A chi-square test
2To test whether cars on the A train were more likely to be CLEAN than cars on the C train, you would use:
- A two tailed test of the difference of means
- A one tailed test of the difference of means
- A one tailed test of the difference of proportions
- A chi-square test
3In your data, the correlation between DELAY and CLEANLINESS, r = – 0.4 (p = .001). That means that:
- Trains that experience longer delays are significantly cleaner
- Trains that experience longer delays are significantly less clean
- The association between DELAY and CLEANLINESS is not statistically significant at p < .05
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