Answer Happy

7 Can mobile devices (such as phones and tablets) and radio transmitters interfere with airplane instruments? In some independent studies they registered a total of 180 incidences of airplane instruments malfunctioned when personal mobile devices were or were not used. When they were used by mobile devices, the main communication frequency that the FCC bans is 800 MHz (since it is believed to interfere with planes communications). The incidents were categorized in the following table: affected instruments\use of phones 800-MHz No use Galvanometers 20 40 Navigation systems 20 100 Using the P-value test the hypothesis that the use of mobile phones does not interfere with airplane instruments. Proceed through the following steps. a) State and rigorously formulate the hypotheses Ho and Hı. b) Form an expanded contingency table. c) Find , and d) the P-value, e) Interpret your result. Hint. Use the following formula R с q = η (Σ Σ. -1) = (+ n (30 pts) n nun