The histogram in Fig. 35 describes the durations (in minutes) of up to 270 minutes of UFO sightings reported to the UFO National Reporting Center during the period May 14€“31, 2014.
Fig. 35

a. Describe the shape of the distribution.
b. Which is larger, the mean or the median? Which is a better measure of the center? Explain.
c. The durations of up to 25 minutes of UFO sightings are described by the histogram in Fig. 36. Describe the shape of the distribution.
d. Guess why there are spikes at the following times (in minutes): 5, 10, 15, 20, and 25. What type(s) of bias occurred?
Fig. 36

e. By inspecting both Figs. 35 and 36, is it reasonable to assume that the mean is even greater than the median than if one were to inspect only Fig. 35? Explain.

Transcribed Image Text:

Durations of UFO Sightings 300 293 250 200 150 100 50 17 10 50 100 150 200 250 300 Minutes Durations of UFO Sightings 60 50 40 30 20 10 10 15 Minutes 20 25