High Voltage, Inc., a light bulb manufacturer, wants to know if there's a difference in mean life span between its product and that of a competitor.
They collect paired data and calculate the difference in each pair to create
one set of numbers that represents the differences within each pair. What
notation should High Voltage use to construct its null and alternative
hypotheses?

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?