It is commonly believed that cities with population of 500 and higher have on average higher manufacturing than the cities with population of less than 500. UsePollutiondata and your statistical expertise to answer the questions: Is this a reasonable belief?

4. What test/procedure did you perform?

• a. One-sided t-test
• b. Two-sided t-test
• c. Regression
• d. Confidence interval

5. Statistical Interpretation

• a. Since P-value is small we are confident that the slope is not zero.
• b. Since P-value is small we are confident that the averages are different.
• c. Since P-value is too large the test is inconclusive.
• d. None of these.

6. Conclusion

• a. Yes, I am confident that the above belief is correct.
• b. No, I cannot claim that the above belief is correct.

Task 1