Reconsider the previous exercise about the study of the effect of wing length on the flight time of paper helicopters. Recall that there were two wing lengths of interest: 2 cm and 3 cm, and that flight time was measured in seconds taken for a paper helicopter to hit the ground after being dropped from a height of 10 feet. Suppose that instead of two wing lengths, there were four wing lengths of interest: 2 cm, 2.50 cm, 3 cm, and 3.50 cm.
a. Would a two-sample t-test still be a valid approach to analyzing the data? If yes, explain why. If no, explain why not.
b. Would ANOVA still be a valid approach to analyzing the data? If yes, explain why. If no, explain why not.

Data from previous exercise

In a study of the effect of wing length on the flight time of paper helicopters, two wing lengths were of interest: 2 cm and 3 cm. Two paper helicopters were made, one with a wing length of 2 cm and the other with 3 cm. All other aspects of the helicopters were made to be as identical as possible. Each helicopter was repeatedly dropped from a height of 10 feet and flight time was measured in seconds taken for the helicopter to hit the ground.