AdServe is аn in-аpp videо аdvertising cоmpany. The cоmpany offers a platform that embeds video ads in mobile apps to encourage users to download and install additional apps. When a user launches an app, his or her device sends a request to AdServe for an ad. For instance, suppose Malcolm is playing the game Sonic Dash. AdServe’s platform determines the best ad to serve to Malcolm while he plays Sonic Dash. Suppose AdServe decides to serve Malcolm an ad for the game Hay Day. Assuming Malcolm is still playing Sonic Dash when the ad is served, he sees the video for Hay Day. If Malcolm is interested in learning more about Hay Day, he clicks on the ad and is redirected to the app store. He might then decide to install Hay Day. On a typical day, using its current ad-serving algorithm (Algorithm A), AdServe experiences a 5% click-through rate. Analyzing consumer data, AdServe has realized that small improvements in click-through rates could have a large effect on the firm’s revenue. Realizing this, the company has developed a new ad-serving algorithm (Algorithm B) that could potentially improve the click-through rate. The company now wants to test whether the click-through rate of the new algorithm is significantly different from that of the existing algorithm. As is typical in such experiments, the two conditions, A (AdServe’s existing algorithm) and B (the new algorithm) would be evaluated in parallel on randomly assigned users. a. (5 points) Develop a null and an alternative hypothesis to examine whether the performance of the new algorithm (Algorithm B) is different than that of the existing algorithm (Algorithm A) in affecting the click-through rate. b. (5 points) You used an independent sample t-test to test the hypotheses. Below is the test result. Do you think AdServe should adopt the new algorithm? Why or why not? Average CTR of algorithm A: 0.0492 Average CTR of algorithm B: 0.0506 t = - 1.030 p-value = 0.3030
Inhibitiоn оf which оf the following cell components would prevent binding of the protective аntigen of аnthrаx toxin to the cell surface:
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