The poll randomly sampled 300adult B.C. residents, and isconsidered accurate within plus orminus 5.6 per cent, 19 times out of20. Pollster Kyle Braid said theresults provide "a good snapshot" ofthe province on the issue ofenvironmental action.In particular, Braid noted that 72per cent of poll respondents agreedthat "drastic action" is required rightnow to save mankind.The poll - conducted Nov. 10-16by Ipsos Reid - also found that mostB.C. residents give themselves anabove-average grade when it comesto assessing their environmentalperformance, but fewer than 10 percent of respondents say they aredoing all that they can to help.QUESTION: How large a random sample of adult Canadiansis required to estimate the percentage that feelthat they are doing all that they can to help savethe environment if the estimate is to be accuratewithin 2 per cent, 99 times out of 100? Incalculating your answer, assume that allCanadians feel about the same on this issue asBritish Columbians.HELP: I need someone to explain how the answer was obtained below! Please can you say step by step in easy language! I don't get where the top part of the equation came from

76.3% of BC adults believe that "drastic action" is needed right now to save mankind. (6 marks) Sample size for estimating p: n= z pq [ME(P)]' Here ME( p ) = 2% = 0.02. Question says to assume that Canadians feel about the same as BC adults, so don't take "worst case" for pq; rather, take pq = (0.1)(0.9). "99 times out of 100" = 0.99, so z* = invNorm(.995, 0, 1) ~ 2.5758. 0.5% 0.5% 99% Substituting into the formula gives 2.57582 (0.1)(0.9) n ~ 1492.82 [0.02]2 - z* O Randomly sample at least 1493 adult Canadians. (2 marks) Question 13 (10 marks total) a. This study is an experiment because the researchers randomly assigned the subjects to the treatment groups, whereas in an observational study, the