Tips a pizza delivery driver. always trying to increase tips. runs an experiment on his next 40 deliveries. he flips a coin todecide whether or not to call a customer from his mobile phone when he is five minutes away, hoping this slight bump incustomer service will lead to a slight bump in tips. after 40 deliveries, he will compare the average tip percentage betweenthe customers he called and those he did not. what are the experimental units and how did he randomize treatments?

Which is a graph of a proportional relationship?

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?

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function