The table shows the costs of sending a parcel by the Express service and by the Rapid service. Type of service
Cost
Express
£15.25
Rapid
£35.38
Brendan has to send 12 parcels.
It will be cheaper to send the parcels by the Express service than by the Rapid service.
(a) How much cheaper?

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?