Many people have trouble setting up all the features of their smartphones, so you developeda YouTube video to help them. If you have evidence that less than 90% of the viewers andydar video helpful, then you will pull it down and make a new video, otherwise you will leave it up on your channel. Somehow, you were able to survey a random sample of 200 viewers and 174 ord that your video was helpful. (a) What is the population of interest? (b) Do we have any evidence to suggest that your YouTube video is not helpful? Explain. (c) Assuming all condition for inference are met. Is there enough evidence at the significant level 0.05 to suggest that your YouTube video is not helpful? Explain. a cO no = 000-0> (d) Would you have make a different conclusion if you use the significant level 0.10? Explain