Question: A regional airport is considering the purchase if a new visibility sensor system to be used in conjunction with air traffic control equipment. The managers have narrowed the choices down to two suppliers: Vanguard and Scorpion. To help make the final selection, the two suppliers agreed to participate in test. The two sensors were temporarily installed side by side at the airport. Visibility readings from each sensor were recorded on 5-minute intervals for a 24-hour period. The resulting data is on a file called Visibility.

a. Discuss whether the samples can be treated as independent, or if they are in fact paired samples. Be sure to state your reasoning.

b. Perform hypothesis testing using a p-value, assuming that the samples are independent and using a significance level of 0.05. Discuss your results.

c. Perform the hypothesis testing assuming that the samples are independent. Use a significance level of 0.05 and discuss your results. How does the conclusion compare with the one reached in part b?