From an aeroplane vertically above a straight horizontal line, the angles of depression of
two consecutive kilometer stones on the
opposite side of the aeroplane are found to be
U and
(1) Find the distance of the aeroplane from
kilometer stone at an angle of depression
0 Find the distance of the aeroplane from
kilometer stone at an angle of depression
B
tin Show that the height of the aeroplane is
tan +tan B
(iv) Find the distance between two consecu-
tive kilometer stones
Write the formulae used in the solution

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below. correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance. what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?